Determinants of Foreign Policy: Concept and Framework

Every state that touches another state has a foreign policy, whether or not it has written one down. The interesting question is not whether policy exists but what produces it — why a state with a particular history, economy, geography and leadership arrives at one set of external choices rather than another. The study of determinants is the attempt to answer that question systematically, and its central difficulty is that almost everything influences foreign policy a little while very little determines it outright.

What Foreign Policy Is

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• Foreign policy is the strategy a national government adopts to pursue its goals in relations with external entities — other states, international organisations and, increasingly, non-state actors.
  • Every state has one. Policy may be incoherent, unwritten or contradictory, but a state that trades, borders, borrows or defends itself is making external choices continuously, and the pattern of those choices is its policy.
• Declared policy and actual behaviour are separate objects, and the gap between them is often the most revealing thing about a state.
  • Declaratory policy is what a government says its principles are; operational policy is the pattern observable in votes, deployments, tariffs, aid flows and abstentions.
  • The analyst’s task is to explain the operational record, treating declarations as evidence about intention rather than as description of conduct.

• The purpose of foreign policy is conventionally stated as safeguarding and promoting the national interest, with security, autonomy, prosperity and prestige as the standard goal-categories; states rank them differently and change the ranking over time. Because the interest is itself contested, saying policy serves it explains less than it appears to.
• The question is an ancient one. Kautilya’s Arthashastra offers a codified approach to statecraft built on the premise that states act in their political, economic and military self-interest, treating relative power, terrain and alliance as a technical rather than a moral calculation. The contemporaneous Thirukkural devotes a whole chapter to the attributes of an envoy.

Foreign Policy Analysis and the Levels of Analysis

• The field exists because the state cannot be treated as a single mind. Classical realism modelled states as unitary rational actors — billiard balls whose internal composition could be ignored because any state in the same structural position would behave alike.
  • But it predicts that two similarly placed states will act identically, which they visibly do not, and it cannot explain policy that is self-defeating on the state’s own terms.
  • Foreign policy analysis opens the black box, asking who decides, on what information, under what bureaucratic and psychological constraints.
• The levels-of-analysis device is the organising frame for the whole subject: it sorts explanations by where the causal variable sits rather than by what it is.
  • Kenneth Waltz’s three images, in Man, the State and War, locate the causes of war in human nature, in the internal composition of states, and in the anarchic structure of the system.
  • Waltz concluded that the third image is permissive — anarchy is what allows war, the first two supply its occasions — and built structural realism on that.
  • J. David Singer formalised the choice as the level-of-analysis problem: system-level explanation buys generality at the cost of detail, unit-level explanation the reverse, and incoherence follows from switching levels mid-argument without noticing.

Rosenau’s pre-theory and the ranking of variables

• James Rosenau’s pre-theory of foreign policy made the crucial move from listing causes to ranking them: a list says what might matter, a pre-theory says in what order it matters for a given kind of state.
  • His five sets of variables are idiosyncratic (the decision-maker’s own attributes), role (the office rather than the occupant), governmental (the structure of authority), societal (non-governmental attributes of the society) and systemic (the external environment).
  • Their relative potency varies with three properties of the state: its size, its level of economic development, and the openness of its polity.
  • Crossing three binaries yields eight ideal types, each with a predicted ranking — systemic variables weigh heaviest on a small, underdeveloped state, societal and governmental variables on a large, developed, open one.
  • The claim in a sentence: the same determinant does not carry the same weight everywhere.
• Snyder, Bruck and Sapin shifted attention from objective conditions to the definition of the situation — decision-makers respond to the world as they perceive it, so policy follows the perceived situation even when the perception is mistaken.
  • This makes the decision-making unit the proper object of analysis, and supplies the standard reply to structural realism: structure reaches policy only through somebody’s interpretation of it.
• Graham Allison showed that one decision can be explained as rational choice, as organisational output and as the resultant of bureaucratic bargaining, the three models generating different predictions from the same evidence.
  • Robert Jervis established that misperception is systematic rather than random. Both are developed in the companion note on systems theory and scientific approaches to international relations; they place perception and process among the determinants.

Internal Determinants

History and historical memory

• History shapes policy by supplying the analogies through which new situations are read. A state invaded through a particular corridor treats that corridor as a strategic problem for centuries.
  • It works through perception, not through the past itself — what operates is the version that is taught, commemorated and politically usable, which is why two states hold irreconcilable memories of one event.
  • History also constitutes identity: a state’s sense of what kind of actor it is — victim, civiliser, revisionist, guarantor — is assembled from a narrative and then supplies the premises of policy.
  • Analogy is double-edged. Munich taught one generation that appeasement invites aggression; Vietnam taught the next that intervention invites quagmire. Each lesson was correctly drawn from its own case and wrongly applied elsewhere.
• Historical antagonism is not destiny. France and Germany fought in 1870, in the First World War and in the Second; within a decade of 1945 the same two states were the joint architects of European integration, beginning by pooling coal and steel — the industries of war-making — precisely because it made another war materially difficult.
• The colonial experience is a distinct historical determinant for states emerging from empire, generating suspicion of great-power tutelage, a preference for sovereignty-protective rules, and solidarity with other post-colonial states. India is one instance among many, developed in the companion note on India’s determinants.

National identity, culture and soft power

• National identity is a state’s self-perception of its place in the global order, setting what a government believes it is entitled and obliged to do.
  • A superpower and a middle power draw on different repertoires. A state that understands itself as system-shaping reaches for global agendas, alliance leadership and rule-writing; one that understands itself as regionally consequential reaches for coalition-building, mediation and niche influence.
• Culture enters chiefly through what Joseph Nye named soft power — obtaining preferred outcomes by attraction and agenda-setting rather than coercion or payment.
  • Its resources are culture, political values and the perceived legitimacy of a state’s policy; its carriers in an era of globalisation and information technology are film, literature, music, cuisine, education and diaspora.
  • It is slow, diffuse and largely outside government control, which limits its use as an instrument even where it is abundant. The concept and its critique are developed in the companion note on soft power.

Political structure and regime type

• Who decides, and under what constraints, is itself a determinant — the same external situation produces different policy depending on the architecture of authority.
  • Democracies and authoritarian systems differ in speed, reversibility and credibility. Authoritarian systems decide quickly and reverse quietly; democracies decide slowly, in public, and find reversal costly.
  • Within democracies the variation is large, and the structural questions are whether the agency handling external relations is elected or appointed, staffed by specialists or generalists, centralised in a leader’s office or dispersed across ministries, and how far the legislature ratifies treaties or controls the purse rather than merely debating.

Democratic peace theory

• The democratic peace is the strongest empirical regularity claimed in international relations and the clearest case of regime type operating as a determinant.
  • Immanuel Kant is the ancestor: Perpetual Peace argued that republican constitutions tend toward peace because those who bear war’s costs must consent to it, and that a federation of republics, joined by commerce and cosmopolitan right, could make peace durable.
  • Michael Doyle revived the argument for the modern discipline, translating Kant’s republics into liberal democracies and showing the record of wars between them was close to empty.
• Three versions circulate, and they are not equally supported.
  • The monadic version — democracies are more peaceful in general — has weak support; democracies fight frequently, including wars of choice against non-democracies.
  • The dyadic version — democracies do not fight each other — survives testing and carries the debate.
  • The systemic version holds that as the proportion of democracies rises, the overall incidence of war falls.
• Two families of explanation compete, and they are complements more than rivals.
  • Normative: leaders socialised in a politics of negotiation, compromise and non-violent transfer of power externalise those norms, extending to fellow democracies a presumption of good faith they deny autocracies.
  • Institutional: checks and balances, electoral accountability and the need for a large winning coalition make war costly and slow to authorise — and these constraints are visible to the other side, reducing miscalculation.
  • Audience costs, associated with James Fearon: a democratic leader who threatens and then retreats is punished by voters, so democratic commitments are more credible, and higher credibility means less of the bargaining failure that produces war.
• The criticisms are serious and the debate is not closed.
  • Definitional gerrymandering. The finding is sensitive to thresholds — how much of the population must vote, how many battle deaths make a war — and critics allege awkward cases are reclassified one by one rather than by revising the coding rules.
  • The small-N problem. Democracies were rare before the twentieth century and allied thereafter, so the number of democratic pairs with both opportunity and willingness to fight is small, and rare events make causal inference fragile.
  • Layne’s realist rebuttal. Examining crises where democracies came close to war with each other, Christopher Layne found that what restrained them was calculation of interest and relative power, not shared norms; the correlation weakens once interests are controlled for.
  • The alliance objection. Gowa and Farber found the effect robust chiefly after 1945, when democracies were bound by a common Soviet threat — suggesting a peace produced by alliance under bipolarity rather than by regime type.
  • Rosato’s challenge. Democracies have fought colonial wars, intervened covertly against elected governments and mobilised nationalist publics as effectively as autocracies; if the norms do not operate, the normative mechanism cannot be doing the work.

Political leadership and idiosyncratic factors

• Idiosyncratic factors are the attributes of the individual decision-maker — beliefs, personality, cognitive style, emotional state, experience — that would produce different policy if another person held the same office in the same circumstances.
  • The test is counterfactual substitution: would another leader, facing this situation with this information and these constraints, have chosen otherwise? Where the answer is clearly yes, the individual is doing causal work.
  • They matter most in crises, where decisions are compressed and authority concentrates; where institutions are weak or authority is highly centralised; where the situation is novel and no standard procedure applies; and where a leader has long tenure and deep personal engagement with external affairs.

The classical statement

• Thucydides offers one of the oldest recorded exercises in foreign policy analysis, and its logic is explicitly idiosyncratic. He contrasts Pericles, whose cautious strategy against Sparta rested on naval strength and the avoidance of land engagements, with Alcibiades, whose recklessness abandoned that plan and led Athens to ruin.
• Machiavelli’s The Prince is constructed as a guidebook for the individual ruler, offering a template of personal conduct — on reputation, cruelty, alliance and the reading of fortuna — on the premise that the ruler’s own judgement is the decisive variable in a state’s survival.
• Kautilya’s Saptanga theory treats the king as the nabhi — the navel, the hub of a wheel from which the spokes radiate, the element that animates the other six. The corollary is directly about agency: a capable ruler converts unfavourable elements into favourable ones, while a weak and irresolute one cannot make the favourable ones count.

The modern literature on leaders

• Operational code analysis asks what a leader’s fundamental political beliefs are and treats them as a stable filter through which information is processed.
  • Nathan Leites originated the approach in his study of Bolshevik decision-making, reconstructing the rules of conduct the elite held.
  • Alexander George systematised it into philosophical beliefs — is politics harmonious or conflictual, how predictable is the future, how far can one control historical development — and instrumental beliefs — how goals are selected, how risk is calculated, when to act.
  • Alexander George and Juliette George showed how personality and early formative experience carry into the conduct of high office, and into rigidity in the face of contrary advice.
• Margaret Hermann’s leadership trait analysis operationalised personality by coding leaders’ spontaneous speech against a fixed set of traits.
  • Belief in one’s ability to control events — whether outcomes are seen as shapeable or given.
  • Need for power — concern with establishing, maintaining and restoring personal influence.
  • Self-confidence — the leader’s sense of self-importance and adequacy to the task.
  • Conceptual complexity — capacity to see multiple dimensions and gradations, against categorical perception.
  • Task orientation — whether attention fixes on accomplishing the goal or on relationships and group morale.
  • Distrust of others and in-group bias — wariness of outsiders’ motives, and the conviction that one’s own group is central and superior.
  • The traits combine into styles, predicting whether a leader challenges or respects constraints, is open or closed to information, and is driven by problems or by relationships.
• Belief systems and cognitive consistency supply the general mechanism.
  • Decision-makers hold images of other states — of hostility, capability, reliability — which resist disconfirming evidence because consistency is cognitively cheaper than revision.
  • The inherent bad faith model is the extreme case: an adversary’s conciliatory moves are read as deception and its hostile moves as confirmation, so no evidence can improve the assessment.
  • Jervis’s misperception operates here — assuming one’s own benign intent is obvious, and reading others’ behaviour as dispositional while reading one’s own as situational.
• Prospect theory replaces expected-utility maximisation with evaluation of outcomes as gains and losses against a reference point.
  • Losses loom larger than equivalent gains, so leaders are risk-averse over gains and risk-acceptant over losses.
  • States are therefore far readier to gamble to recover or prevent a loss than to acquire something new of equal value — which explains otherwise irrational escalation and the difficulty of persuading a state to ratify a defeat.
• Irving Janis’s groupthink locates the pathology in the small decision group rather than the individual.
  • Cohesive groups under stress suppress dissent to preserve unanimity, producing illusions of invulnerability, stereotyped adversaries, self-censorship and self-appointed mindguards who shield the group from disconfirming information.
  • The result is poor canvassing of alternatives, unexamined risks and no contingency planning — a defective process producing a decision no member individually believed in.
  • The remedies are procedural — an assigned devil’s advocate, the leader withholding preferences until options are aired, independent subgroups, outside experts — which makes decision architecture itself a determinant.
• The limits of idiosyncratic explanation deserve stating as plainly as the case for it. Personality works on options that structure, capability and institutions have already narrowed. The individual level explains variation within a range, not the range itself — its strongest use is to explain timing, style and the option selected, not a state’s direction across decades.

Economy: size, structure and model

• A strong economy is the precondition of every other instrument. Military capability, aid, technology and the capacity to absorb the cost of sanctions all rest on it, which is why economic weight and diplomatic weight track each other over the long run.
  • Economic weakness narrows the menu. A capital-scarce state needing aid, technology and market access must weigh those needs against positions it might otherwise take, and its leverage is limited by what it has to withhold.
• The economy supplies distinct instruments in its own right.
  • Aid and concessional lending buy access, goodwill and sometimes votes; their withdrawal is itself a lever.
  • Market access is the largest instrument a big economy holds, because admitting or excluding others reshapes their calculations without any use of force.
• The economic model functions as an alignment cue. A state organised on state-socialist lines finds its partners, technology sources and institutional templates among similar economies; one that liberalises acquires interests, constituencies and dependencies pulling it toward the states dominating global capital markets. The reorientation of many developing economies after 1991 followed this logic.

Complex interdependence and its critics

• Robert Keohane and Joseph Nye’s complex interdependence described a condition in which the realist model no longer fits, defined by three characteristics.
  • Multiple channels connect societies — interstate, transgovernmental (agencies dealing directly with foreign counterparts) and transnational (firms, banks, civil society) — so the state is not the sole conduit of contact.
  • There is no hierarchy among issues: military security does not automatically dominate the agenda, and the agenda itself becomes contested.
  • Military force is unused or irrelevant among such states — not because it has been abolished, but because using it against a deeply interdependent partner is self-defeating.
• The liberal claim is that interdependence dampens conflict: war destroys the aggressor’s assets as surely as the victim’s, and a dense population of stakeholders acquires an interest in peace. Conflict migrates from military to economic and legal channels rather than vanishing.
• The realist reply is that interdependence is a relationship of power, not of harmony.
  • Relative gains: under anarchy a state must ask not only whether a transaction benefits it but whether it benefits the other side more, because today’s disproportionate gain is tomorrow’s capability gap. This is why trade among rivals is politically difficult even when mutually profitable.
  • Asymmetric interdependence is leverage: dependence is rarely symmetric, and the less dependent party can threaten disruption more credibly.

Weaponised interdependence and economic statecraft

• Henry Farrell and Abraham Newman showed how the networks liberals treated as pacifying become instruments of coercion.
  • Global economic networks tend toward hub-and-spoke topologies, because network effects and efficiency reward concentration; a handful of nodes carry most of the world’s financial messaging, payments clearing, data traffic, chip design and mineral processing.
  • The state with jurisdiction over a hub gains two capabilities. The panopticon effect is informational — control of a hub reveals flows and lets a state infer an adversary’s intentions and vulnerabilities. The chokepoint effect is coercive — the same control lets it deny access, imposing severe costs with no shot fired.
  • The paradigm cases are financial messaging and dollar clearing used to cut targeted banks out of the payments system, advanced semiconductor design tools and fabrication as a technology chokepoint, and rare-earth and critical-mineral processing as a raw-material one.
• Critical minerals are the clearest current instance, and the asymmetry is one of processing rather than geology.
  • China holds a commanding share of global refining capacity across rare earths, battery-grade graphite, lithium, cobalt and manganese, projected to remain dominant into the next decade, and has used export licensing as leverage in trade bargaining.
  • Responses have been industrial rather than diplomatic — stockpiling, state equity, defence-credit financing and offtake partnerships, with designated strategic projects and mobilised public funding in Europe.
  • The gap between announced frameworks and delivered capacity is the recurring finding: declaring a strategy is quick, building refining capacity is slow, and the interval is exactly when the chokepoint retains its value.
• De-risking has replaced decoupling as the organising vocabulary, and the distinction is substantive: decoupling severs the relationship, de-risking retains it while reducing the concentration that makes it coercible — diversifying suppliers, building redundancy at chokepoints, screening investment in sensitive sectors, and treating supply-chain concentration as a security variable rather than an efficiency one.

Domestic public opinion and societal forces

• Public opinion is the collective preference of a population, inferred from polling, elections, media and increasingly from social platforms — and whether it counts as a determinant has been argued for a century.
• The realist position: foreign policy is properly elite business.
  • The public is uninformed about the substance, has no direct experience of it, and holds views that are shallow and easily moved.
  • Subjecting policy to opinion compromises rationality, introducing moralism, short horizons and susceptibility to manipulation into a field requiring continuity and discretion.
  • This hardened into the Almond-Lippmann consensus: opinion on foreign affairs is volatile, lacks coherent structure, and has little influence on policy in any case.
• The revisionist finding overturned all three propositions.
  • Benjamin Page and Robert Shapiro showed aggregate opinion is stable, moving in comprehensible directions in response to real events — individual volatility largely cancels out, leaving a “rational public” more coherent than any individual in it.
  • Ole Holsti assembled the challenge point by point, showing opinion is structured around durable belief systems — broad postures such as militant and cooperative internationalism — rather than random, and that policy is not insulated from it.
  • The settled position is neither pole: opinion constrains rather than directs, setting outer limits and imposing costs on leaders who cross them while leaving wide discretion within them.
• Opinion is not uniformly influential across issues. It bites hardest where an issue is salient, simple and emotionally charged — a hostile neighbour, casualties, a territorial dispute, migration — and is nearly absent on trade rules, treaty drafting or export controls, where a small attentive public and organised interests dominate.
• The CNN effect named the claim that real-time coverage of humanitarian emergencies forces governments to act against their strategic judgement.
  • The strong version — that coverage drives intervention — has largely failed testing; coverage more often follows official attention than precedes it.
  • The supported version is that coverage accelerates decision cycles and raises the political cost of visible inaction.

Interest groups, lobbies and the media

• Organised interests convert diffuse opinion into concentrated pressure, and are effective in inverse proportion to public attention: on low-salience issues a well-organised minority with an intense preference beats an indifferent majority.
  • Ethnic and diaspora lobbies shape policy toward countries of origin, supplying votes, funding and expertise, and matter most where the issue is invisible to everyone else.
  • Business and export sectors lobby on tariffs, sanctions, market access and visas, and firms with cross-border assets act as a restraining constituency against escalation; defence-industrial interests shape procurement and arms transfers, which shape alignment.
  • The media works in three roles at once — conduit for official messaging, agenda-setter determining which events register, and watchdog raising the cost of concealment — and media systems weight the three very differently.

Putnam’s two-level game

• Robert Putnam’s two-level game is the bridge concept between domestic and international bargaining, and the most useful single tool for thinking about domestic determinants.
  • A leader negotiates simultaneously at two tables: internationally with foreign counterparts (Level I) and domestically with the legislature, party, coalition partners and interest groups whose consent is required (Level II).
  • The win-set is the set of international agreements that would be ratified at home. Agreement is possible only where win-sets overlap, so domestic politics does not merely influence policy — it defines the feasible bargaining range.
  • A narrow win-set is a source of strength. A leader who can credibly say nothing more generous will pass at home extracts better terms — the “tied hands” advantage — while wide domestic latitude means more freedom and less leverage.
  • Involuntary defection is the characteristic failure: a leader signs in good faith and the domestic level refuses ratification, damaging both the agreement and future credibility.

Ideology

• Ideology is a structured set of beliefs about how the world works and how it ought to work, and it enters foreign policy not as decoration on interest but as an independent input.
• Four things ideology does in foreign policy.
  • It supplies goals — world revolution, the spread of democracy, the restoration of a religious order, national unification — none of which can be derived from security or wealth alone.
  • It defines friends and enemies, partitioning the world into progressive and reactionary, free and unfree, believer and infidel, and this classification precedes any calculation of interest.
  • It legitimises action, supplying the vocabulary in which policy is justified at home and abroad; a state that has justified itself in one idiom becomes partly captive to it.
  • It constrains options, because some moves would be unintelligible to a state’s own supporters — a genuine limitation on choice rather than on rhetoric alone.
• The central debate is whether ideology drives behaviour or merely dresses it.
  • The realist position is that ideology is epiphenomenal — states pursue security and power and discard doctrine whenever it conflicts with interest, the evidence being the ease with which ideological states ally against ideological kin.
  • The reply is that ideology shapes what counts as interest: which threats are perceived, which gains valued and which risks run are read through a framework, and ideology supplies it.
  • The synthesis most scholarship accepts is that ideology operates strongly on long-run direction, the selection of adversaries and the definition of threat, and weakly on immediate crisis choices, where material constraint dominates.

The cases the debate turns on

• Soviet foreign policy is the classic test, because the tension is internal to the doctrine. Commitment to world revolution implied support for revolutionary movements irrespective of state interest; socialism in one country subordinated that to the security and industrialisation of the Soviet state.
  • The result was a policy revolutionary in vocabulary and frequently conservative in practice — most starkly in the non-aggression pact with Nazi Germany. Ideology set the frame and interest selected within it.
• Chinese foreign policy shows ideological reorientation without a change of ruling party. The Maoist period conducted a revolutionary internationalism — support for insurgencies, export of revolutionary models, a split with Moscow argued in doctrinal terms.
  • From the late 1970s the operative doctrine became development first, with a low profile kept while capability accumulated: the vocabulary was retained and the behaviour changed almost entirely.
• American liberal internationalism is the mirror case. Democracy promotion and the building of open institutions are genuinely ideological objectives pursued at real cost, and they have coexisted with support for friendly authoritarian governments where interest required it. The inconsistency is evidence for both sides of the argument.
• The “end of ideology” claim has not survived. Advanced after 1945 and revived in triumphalist form after 1991, it held that the exhaustion of the great doctrinal contests would leave a politics of technical management.
  • The empirical rebuttal: religious and civilisational mobilisation, ethno-nationalism, authoritarian state-capitalism and contested models of political order have all supplied durable ideological content since.
  • The conceptual rebuttal: the thesis was itself an ideological claim, presenting one political order as the natural terminus of history.
  • Ideological competition has changed subject rather than ceased — the present contest is over the legitimacy of political models and the rules of the international order rather than over ownership of the means of production.

External Determinants

The external environment is not a background against which policy is made; it is the source of most of what a state cannot choose. A government selects its objectives, but the structure of the system, the behaviour of the strongest states, its own place in the capability hierarchy and the geography it cannot move all determine which objectives are attainable and at what price.

The structure of the international system

• Polarity — the number of centres of power — sets the range of available choices before any state decides anything.
  • Bipolarity forces a choice between two blocs and makes third parties valuable precisely because they are uncommitted; alliance management is tight and small states can extract resources by threatening to defect.
  • Unipolarity removes the alternative patron; secondary states adjust to the preponderant power by aligning, hedging or seeking niches where its attention is thin, and the cost of open opposition rises sharply.
  • Multipolarity restores choice by creating several suitors for the same state, which is what makes simultaneous partnerships with rivals thinkable. It also makes alignments less stable and miscalculation likelier, since deterrence must be calculated against several actors at once.
• Waltz’s structural claim is that structure constrains rather than commands. Anarchy — the absence of any authority above states — makes self-help the ordering principle, and the distribution of capability sets the pressures each state faces. Structure does not instruct a state; it punishes those that ignore it, so over time survivors behave as if designed by the system.
• The clearest illustration is the fate of non-alignment. Staying uncommitted was viable and even lucrative because bipolarity created a market for uncommitted states — each bloc had reason to court them and neither could afford to push them into the other camp.
  • When that market vanished the posture lost most of its purchasing power, and what replaces it under multipolarity is simultaneous engagement with several competing centres. The concept is developed in the companion note on strategic autonomy and multi-alignment.
• Great-power behaviour is a determinant distinct from structure. Whether the strongest states are cooperating or competing, whether they will supply security guarantees, technology and capital, and where they choose to compete geographically all reshape others’ options — a split between two great powers opens space for a third party that a rapprochement between them closes.

Relative capability and the power hierarchy

• A state’s position in the capability hierarchy is the best single predictor of the kind of policy it will pursue, largely independent of its ideology, regime or leadership. The conventional division is into great, middle and small powers, and each carries a characteristic logic.

Great powers

• Great powers possess system-wide reach — the capability to project force and influence outcomes far outside their own region, and the assumption that events anywhere may concern them.
  • Their foreign policy is genuinely global, because they define their security perimeter in terms of the whole system rather than a neighbourhood.
  • Their organising aims are maintaining the existing hierarchy and preventing the rise of challengers, which makes them structurally suspicious of rapid growth anywhere, including in states that intend them no harm.
  • They tend toward unilateralism because they can bear the costs of acting alone, which produces the recurrent charge of a moral deficit: rules invoked against others are set aside for themselves.
• John Mearsheimer’s tragedy of great power politics explains why the competition is a structural outcome rather than a moral failing.
  • Under anarchy, where every great power has some offensive capability and none can be certain of another’s intentions, the only reliable guarantee of survival is to be the strongest — so each rationally maximises relative power.
  • Even status-quo states therefore behave expansively, and the tragedy is that all parties may prefer peace and still be driven to rivalry.
  • Mearsheimer adds that global hegemony is unattainable because of the stopping power of water, so great powers settle for regional hegemony and act to stop any other state achieving it in its own region.

Middle powers

• Middle powers are neither strong enough to shape the system nor weak enough to be irrelevant, and the category is defined in two competing ways.
  • The positional definition ranks states by material attributes — economy, population, military spending — and takes the middle band. It is simple, and it produces overlapping and inconsistent lists.
  • The behavioural definition, associated with Cooper, Higgott and Nossal, defines middle powers by what they do: a preference for multilateral solutions, coalition-building with like-minded states, a role as mediator, an embrace of good international citizenship, and niche diplomacy — concentrating limited resources on a few issues where the state can be genuinely consequential.
  • A further distinction separates traditional middle powers — wealthy, stable, not dominant in their own regions, working through established institutions — from emerging ones, which are regionally preponderant, more recently democratised, and oriented to reform of the international order rather than its maintenance.
• The behavioural logic follows from the position: a state that cannot impose an outcome must assemble one, so it invests in institutions, rules and coalitions that let aggregated weight substitute for individual weight.
  • Its sphere of concern is typically regional rather than global, and it is not unilateral, being neither economically nor militarily strong enough to act alone against opposition.
  • Aspiration is a defining feature: rising middle powers build strength and assert themselves even at the cost of appearing provocative, on the calculation that it is better to err on the side of being too powerful than not powerful enough.
  • The criticism is real: the category has no agreed boundary, its lists overlap with the great powers above and regional powers below, and states adopt the label for its respectable connotations rather than because it describes them.

Small powers

• Small powers organise policy around survival, and the recurring problem is striking a balance between security and independence — the more security bought from a protector, the less independence retained.
  • Bandwagoning with a strong state is the standard solution: alignment in exchange for protection and resources.
  • Playing great powers off against one another is the alternative, available only where more than one is interested — which is why small-state autonomy expands under multipolarity and contracts under a single dominant power.
  • Authoritarian small states carry the additional objective of regime security, often at the expense of state security; policy is calibrated to keep the ruling group in power, and external hostility can be useful for that.
  • Asymmetric and unorthodox strategies are characteristic — nuclear or missile programmes as equalisers, hosting foreign bases as rent, offshore finance, flag-of-convenience registries, diplomatic votes as a tradeable asset, and specialisation in mediation or peacekeeping.

Balancing, bandwagoning and the balance of threat

• The classical expectation is that states balance against power — concentrations of capability provoke counter-coalitions and the system tends to restore equilibrium.
• Stephen Walt’s balance-of-threat theory refined this: states balance not against power as such but against threat, a compound of aggregate power, geographic proximity, offensive capability and perceived intentions.
  • The refinement resolves an anomaly pure balance-of-power theory cannot — why states cluster with the strongest coalition rather than against it, as they did in aligning with a far more powerful United States against a weaker but more proximate and more menacing Soviet Union.
  • Bandwagoning is the minority behaviour, chosen chiefly by weak states with no prospect of affecting the outcome, states with no available allies, and states seeking a share of an expected victor’s spoils. The subject is developed in the companion note on balance of power.

Alliances, coalitions and institutional membership

• Membership of an alliance or organisation is a determinant because it forecloses options. Globalisation and regionalisation have produced dense overlapping memberships — regional, global, military and trade — each carrying obligations that constrain later choice.
  • Groupings that present themselves as cohesive must operate by consensus, which means aligning member positions in advance. NATO, the European Union, ASEAN and OPEC each require members to trim national positions to what the group can carry.
  • Powerful members shape the agenda but cannot dictate it, because a consensus body leaves every member a residual veto and the group’s value depends on the appearance of unity.
  • For weaker members the constraint is heaviest: they gain protection, market access or price discipline and surrender the ability to take independent positions on the issues the group has claimed.
• Alliances also change how other states behave toward the member, since a security guarantee alters an adversary’s calculation even when never invoked. This is why the prospect of an adversary’s alliance reaching one’s own border has repeatedly been treated as a first-order security question.
• Glenn Snyder’s alliance security dilemma identifies the two opposite fears membership generates at once.
  • Entrapment — being dragged into a conflict over an ally’s interests the state does not share, because the commitment cannot be visibly qualified without destroying it.
  • Abandonment — the ally failing to honour the commitment when it is needed, through defection, realignment or simple inaction.
  • The two trade off: reassuring an ally against abandonment raises entrapment risk, and hedging against entrapment raises abandonment fears. Every alliance is managed somewhere on this dial.
• States also stay out of regimes deliberately, and the logic mirrors that of joining: a state declines where accession would foreclose a capability it means to retain or ratify a status it rejects. India’s long abstention from the Nuclear Non-Proliferation Treaty illustrates the point — the objection was to a treaty dividing the world permanently into recognised and unrecognised possessors.

Geography, geopolitics and geo-economics

• Geography is the most durable determinant because it is the one a state cannot change. Governments, ideologies, economies and alliances turn over; location, terrain, rivers, coastline, climate and mineral endowment do not.
  • Location determines neighbours, and neighbours are not chosen. A state bordering hostile or unstable neighbours carries a permanent continental preoccupation regardless of what its leaders would prefer to be doing.
  • Terrain and barriers determine vulnerability: mountains, deserts and seas have bought states insulation, and where such barriers are absent the same invasion routes recur across centuries.
  • Landlocked states are structurally dependent on coastal neighbours for access to the sea, converting a transport question into a permanent constraint on sovereignty and a standing lever for the transit state.
  • Distance thins relations: trade, migration and conflict all decay with distance, which is why ties between geographically remote regions stay modest regardless of shared interests, while a hostile immediate environment can drive a state to extreme measures — Israel’s pursuit of a nuclear capability in a region it read as permanently threatening is the standard example.
  • Geography also sets what a state has and what it must import — arable land, water, hydrocarbons, minerals — and dependence on imported necessities is a durable orientation toward suppliers.

Mahan and sea power

• Alfred Thayer Mahan argued that command of the sea is the decisive determinant of national greatness, and that the history of the leading powers is the history of naval supremacy.
  • He identified the elements of sea power: geographical position, physical conformation including harbours and coastline, extent of territory, size of population, national character and the character of the government.
  • His standing example is Britain in the eighteenth and nineteenth centuries, whose global position rested on naval supremacy — protecting its own commerce, denying the sea to rivals, and sustaining a chain of coaling stations and bases across the routes.
  • The prescription follows: concentrate the battle fleet rather than dispersing it, seek decisive engagement, protect commerce, and acquire the bases that make sustained distant operations possible.
• The contemporary reflection of Mahan is the competition for basing and port access, since long-range reach is bought at fixed points along the sea lanes.
  • The joint facility at Diego Garcia; the cluster at Djibouti, where several rival powers hold facilities within a few kilometres of one another; Indian access at Duqm in Oman and facilities under development at Sabang in Indonesia; and the Chinese-financed and Chinese-operated ports across the Indian Ocean littoral described as a “string of pearls.”
  • The last description is contested — commercial investment is not a naval base — but the question of whether commercial access converts to military access under pressure is a real one.

Mackinder and land power

• Halford Mackinder argued the opposite case: that the age of sea power was closing and land power would prove decisive, because railways spanning continental interiors allowed the Eurasian landmass to be developed and defended beyond the reach of naval blockade.
  • His 1904 paper identified the pivot area — the northern-central Eurasian interior, inaccessible from the sea, drained by rivers running to landlocked or ice-bound waters.
  • He later renamed and enlarged this as the Heartland, sitting within the World-Island — the connected landmass of Europe, Asia and Africa, the largest, most populous and richest possible combination of territory.
  • The policy implication he drew was preventing any single power from controlling both East Europe and the Heartland, and so from combining continental depth with Central and East European industrial resources.

“Who rules East Europe commands the Heartland; who rules the Heartland commands the World-Island; who rules the World-Island commands the world.”

Halford Mackinder

Spykman and the Rimland

• Nicholas Spykman inverted Mackinder, and the inversion is the point. The Rimland is Spykman’s concept, not Mackinder’s, and he used it to reject the Heartland thesis rather than to complete it.
  • The Rimland is the densely populated coastal crescent around the Eurasian interior — Western Europe, the Middle East, South Asia and East Asia — an arc holding the great majority of the world’s population and almost all its industrial capacity.
  • His argument was that the Heartland lacked what mattered — population density, industrial capacity and access to the sea — while the Rimland had all three, and that the Heartland’s significance came from its pressure on the Rimland rather than from its own resources.
  • The Rimland is also the zone of contact between land power and sea power, which is why it is the arena in which the two are decided and the region a maritime power must deny to a continental one.
  • Its practical descendant is containment — ringing a continental power with alliances and forward deployments along the coastal arc rather than confronting it in its interior.
  • His counter-dictum inverts Mackinder’s exactly:

“Who controls the Rimland rules Eurasia; who rules Eurasia controls the destinies of the world.”

Nicholas Spykman

The wider geopolitical tradition

• Friedrich Ratzel treated the state as a living organism that must grow or decay, and coined Lebensraum — living space — as the territorial requirement of a growing population; descriptive in his hands, it became prescriptive in others’.
• Rudolf Kjellén, a Swedish political scientist, coined the term geopolitik, developing Ratzel’s ideas into a systematic study of the state as a spatial organism.
• Karl Haushofer built these into a German school and into policy advocacy, and his association with the Nazi territorial programme discredited the whole field for a generation; geopolitics became an academically disreputable word after 1945 and the subject continued under other names.
• Alexander de Seversky argued that air power had superseded both land and sea power, mapping zones of air dominance centred on North America and Eurasia with the polar region as the decisive overlap. His work is the ancestor of the argument that each new domain — air, then space, now cyber — rewrites the geography of power without abolishing it.
• Saul Cohen rebuilt geopolitics as regional analysis, dividing the world into geostrategic realms and geopolitical regions and introducing shatterbelts — fragmented regions drawn into great-power competition — and gateway states that link realms rather than divide them. The scheme is suppler than the single-dictum theories because it allows several centres and change over time.
• Critical geopolitics, associated with Gearóid Ó Tuathail, turned the field on itself: Heartland, Rimland, shatterbelt, East and West are discursive constructions that make particular policies look natural rather than neutral descriptions of a given world. Maps are arguments, and naming a region a shatterbelt is a step toward intervening in it.

Geo-economics

• Edward Luttwak coined geo-economics for a world pursuing adversarial ends by commercial means, arguing that the logic of conflict is now conducted in the grammar of commerce — investment capital replacing firepower, market penetration replacing garrisons, technological advantage replacing weapon superiority.
• The instruments now form a recognised toolkit, each with its own logic.
  • Sanctions and financial exclusion — denial of payments, clearing and reserves.
  • Export controls and entity listings — denial of components, tools and know-how at the technological frontier.
  • Supply-chain and chokepoint politics — leverage from concentration in processing, fabrication or transit.
  • Currency and reserve leverage — the political value of issuing the currency the world settles and saves in.
  • Energy leverage — pricing, volumes and pipeline routing used to shape alignment.
  • Connectivity as strategy — corridor and infrastructure projects creating durable dependence, of which the Belt and Road Initiative is the largest and counter-connectivity schemes such as the India-Middle East-Europe Economic Corridor are the reply.
• Geo-economics does not replace geopolitics; it re-describes it. Corridors run through territory, pipelines cross borders, cables land on coasts and ports need hinterlands, so economic instruments remain geographically constrained even when financially expressed.

Resource endowment and dependence

• Dependence on an imported necessity orients policy toward its suppliers, and the orientation persists across changes of government because the dependence does. Oil import dependence pulls a state toward the producing region — sustaining diplomatic presence, tolerating uncomfortable partners, protecting sea lanes and courting the labour markets that accompany the trade.
• The American shale revolution is the counter-case. As domestic production cut import dependence on West Asian crude, the region’s strategic salience to Washington fell measurably and its posture became more selective — a clean demonstration that when a dependence falls, attention follows it.
• Resource abundance is a determinant in the opposite direction, giving producers leverage over consumers and funding external ambition, while tying a single-commodity exporter’s policy to a price it does not control.

Why geography survives the nuclear revolution

• Nuclear weapons changed the price of great-power war without changing the geography of everything below it. Because mutual vulnerability made total war between possessors close to unusable, competition migrated into a sub-nuclear space that is intensely geographic.
  • Territory still confers what it always did — resources, population, industrial capacity, basing rights, and the ability to deny an adversary all four.
• Chokepoints have become more consequential, not less. The straits of Hormuz and Bab el-Mandeb, the Suez and Panama canals and the Malacca and Taiwan straits carry the bulk of seaborne trade and energy.
  • Disruption at any of them, by states or by non-state actors using drones and cheap precision weapons, raises freight rates, insurance and transit times worldwide within days.
  • Buffer zones and spheres of influence retain their logic precisely because nuclear weapons make direct confrontation unaffordable: competition is displaced onto the ground between the principals.
  • Basing and access are the currency of reach. An arsenal cannot sustain a distant naval deployment, evacuate nationals or escort shipping; ports, airfields and overflight rights can.
  • Nuclear geography is itself geography — survivable second-strike forces depend on sea room for submarines, land depth for mobile launchers, and the siting of early-warning and missile-defence installations.
  • Sub-nuclear competition is where policy actually happens — proxy conflict, sub-conventional pressure, maritime coercion, sanctions, and infrastructure competition — and every one of these instruments has a map.

International institutions, law and norms

• Membership creates obligations that outlive the government that accepted them, and the cost of departure is rarely enforcement but reputation — a state seen to break commitments finds its future commitments discounted.
• Institutions also change interests rather than only constraining them: participation socialises officials into shared expectations and vocabularies, and states begin to define objectives in the terms the institution supplies.
• The constructivist claim goes further — norms are constitutive, not merely regulative. Sovereignty, non-intervention, the prohibition on conquest and the taboo on nuclear use make some interests thinkable and others unthinkable, which is why the range of policies states consider has narrowed even as capabilities have grown.
• The realist objection stands: institutions reflect the distribution of power that created them, are obeyed when obedience is cheap, and are set aside when a powerful member’s core interest is engaged.

Transnational actors and non-state forces

• Multinational corporations, banks and energy and financial markets exert influence through investment decisions, and market judgement disciplines policy directly — a currency or bond market reaction can foreclose an option faster than any diplomatic protest.
• Diasporas supply remittances, investment, advocacy in host countries, and a constituency whose safety becomes a policy obligation.
• NGOs and transnational advocacy networks set agendas and use the boomerang route, appealing to foreign publics to apply pressure that domestic channels will not carry.
• Terrorist and insurgent organisations impose costs a state must answer, and make conditions inside neighbouring states a first-order security question.
• These are treated at length in the companion note on transnational actors in international relations; the point here is that they are determinants rather than merely participants, because their existence changes what governments can attempt.

Global public opinion and the information environment

• States court foreign publics because reputation is convertible — global opinion affects attractiveness, access to partners and the willingness of other governments to be seen alongside a state, which is why public diplomacy is now a standing function.
• Authoritarian states manage information flows in both directions, restricting what enters and shaping what leaves, and invest heavily in external broadcasting to obtain a hearing they cannot get by openness.
• Its actual influence is limited, for a structural reason: sovereign governments are accountable to their own electorates, not to foreign publics. Global opinion can raise the cost of a policy; it cannot vote a government out.
• The contemporary layer changes the mechanics without changing that limit — social platforms let states address foreign populations over their governments’ heads, disinformation has become an instrument of statecraft, and narrative competition now runs alongside events themselves.

Technology and the military balance

• The technological balance determines what force can achieve, and therefore which threats are credible and which objectives attainable.
• Nuclear weapons are the sharpest instance: they make conquest of a nuclear-armed state effectively impossible, shift the utility of force from winning wars to deterring them, and push competition below the threshold at which escalation becomes plausible.
• The offence-defence balance shapes conflict propensity. Where offence is believed dominant, states arm faster and crises escalate; where defence is believed to hold, security is cheaper and reassurance easier.
• Each generation of technology redistributes advantage — precision strike, satellite reconnaissance, drones, cyber capability and the military applications of artificial intelligence — and states resting on a superseded technology lose weight without losing anything material.
• Technological dependence is a determinant in its own right: a state unable to build its own weapons, chips, engines or software has a policy shaped by the need to keep its suppliers content.

Weighing the Determinants

• No determinant has a fixed weight, and the analytical value of the framework lies entirely in establishing which factors dominate for which state at which time.
• Weights vary spatially — a superpower’s determinants are not a small state’s.
  • For a great power, domestic politics, ideology and bureaucratic process carry unusual weight, because the external environment constrains it least and it can afford choices a weaker state cannot.
  • For a small state, systemic factors dominate nearly everything: structure and the preferences of nearby great powers set the menu, and domestic variables determine only which item is selected.
  • Rosenau’s ranking by size, development and openness is the formal statement of this proposition, and remains the most useful attempt to convert a list into a theory.
• Weights vary temporally.
  • Economic determinants weigh far more now than in 1950, because trade, capital and technology are the main channels of contact and the main instruments of coercion.
  • Territorial conquest weighs less, having become costly and normatively prohibited, while access — to markets, chokepoints, data and supply chains — weighs more.
• The critique of determinant lists: they describe rather than explain.
  • A list of everything that matters cannot generate predictions, since any outcome can be attributed after the fact to whichever item fits.
  • A list that explains everything explains nothing — the serious work is ranking, weighting and specifying when each factor operates, not lengthening the inventory.
• The constructivist objection is to the word “determinant” itself.
  • Material facts carry no meanings of their own: geography, capability and history become determinants only through interpretation, and the same mountain range is a barrier to one government and a corridor to another.
  • Interests are constructed rather than given, so a framework treating them as fixed has assumed away the interesting question.
  • Hence a preference for the language of conditions and enabling factors over the language of causation, and an insistence that identity sits alongside material variables rather than beneath them.

National Interest as the Object

• National interest is the stated object that determinants are supposed to serve, and it is both indispensable and analytically slippery.
• Hans Morgenthau made it the core of realism by defining interest in terms of power, arguing that this supplies an objective standard, connects reason to fact, and makes policy intelligible independently of the motives or ideology of statesmen.
• The standard classifications distinguish vital interests, for which a state will fight, from secondary ones it will trade; and permanent interests, persisting across governments, from variable ones that shift with circumstance.
• The central criticism is that the concept is rhetorical rather than analytical: it is invoked to justify decisions already taken, cannot be observed independently of the policy it explains, and in a plural society conceals a contest among particular interests. It is developed fully in the companion note on national interest.

Conclusion

The framework earns its place not by listing influences but by disciplining them — by asking which level an explanation sits on, which factors dominate for a state of this size and openness at this moment, and how much of the outcome is still unexplained once the constraints are counted. Determinants explain why some policies were never available; agency explains which of the available ones was taken.