Realist Approach to International Relations

Realist Approach to International Relations

Why Realism Is Treated as the Discipline’s Hegemonic Theory

Realism is described as the hegemonic — dominant — theory of international relations, and the claim rests on a single explanatory achievement. It offers the most powerful available account of the state of war, which realists take to be the regular condition of life in the international system, not an interruption of it. Every rival approach must explain why the recurring fact of international life is armed rivalry; realism begins from it.

• The core claim is that conflict is systemic rather than accidental, so no reform of institutions or opinion removes it.
  • Other theories treat war as a remediable defect — of misperception, of bad institutions, of undemocratic government.
  • Realism treats war as a standing possibility generated by the way the system is built, which is why the theory has outlasted every announcement of its death.
  • State of war does not mean fighting every day; it means, as structural realists put it, that the possibility of resort to force is never absent, so all states must plan around it.
• Realism is a family, not a single doctrine — a meta-ideology with shared premises and sharply divided schools.
  • Classical realism grounds conflict in human nature.
  • Structural or neorealism relocates the cause to the structure of the system.
  • Offensive realism, defensive realism, neoclassical realism and subaltern realism are the working subdivisions.
• Its other names — political realism, Realpolitik, power politics — mark the same disposition: study the world as it is, not as it might be.
  • This insistence supplied the school’s self-chosen label; “idealist” was the name realists gave, retrospectively, to the interwar scholars they were arguing against.
• Its practical purchase explains its persistence: it supplies a vocabulary of statecraft — interest, power, balance, deterrence, alliance — that practitioners already speak, and it is prescriptive as well as descriptive.

Realism holds the discipline’s centre not because it is optimistic about the world but because it has never had to apologise for the world’s disappointments.

The Intellectual Precursors of Realism

Realism did not begin in 1948. It is better read as an intermittent tradition of statecraft — visible in Greece, buried under empire and Christian universalism, revived in Renaissance Italy and seventeenth-century England, buried again, and finally rebuilt as an academic theory after two world wars. The tradition has two long silences, and understanding why it fell silent explains what it needs to survive: a plurality of competing sovereigns.

Thucydides and the Peloponnesian War

• Thucydides, in the History of the Peloponnesian War, produced the first work that did not merely record events but analysed their causes — which is why realists claim him as their founder.
  • He distinguished the immediate quarrels from the truest cause: it was the growth of Athenian power, and the fear that this caused in Sparta, the established power, that made war inevitable.
  • The mechanism is not ambition but fear, and fear arises from a structural fact rather than a moral failing.
• The Melian Dialogue is the tradition’s founding text on the relation between power and justice.
  • The Athenians tell the Melians that questions of right arise only between equals; between unequals, the outcome is settled by capability.

“Right, as the world goes, is only in question between equals in power, while the strong do what they can and the weak suffer what they must.” — Thucydides

• Why statesmen have limited room is the analytically important point, and it survives into modern structural realism unchanged.
  • Intentions are unknowable. A state can observe another’s capabilities but never verify its purposes.
  • A prudent statesman must therefore respond to capability, not declared intention, which means increasing his own strength.
  • The other state reads that increase as offensive preparation and matches it — an arms race produced by two defensive decisions.
  • This is the security dilemma stated twenty-four centuries before it was named.

The Thucydides Trap and Its Critics

• Graham Allison coined the phrase “Thucydides Trap” and developed it at length in Destined for War; the insight is Thucydides’, the concept is Allison’s.
  • The claim: when a rising power threatens to displace a ruling power, the resulting fear makes war far more likely than either side intends.
• The Harvard study behind the thesis examined sixteen cases of power transition over five centuries, of which twelve ended in war and four did not.
• The standard criticisms are methodological and they are serious.
  • Definitional vagueness — “rise”, “rule” and “rapid shift” are never given measurable thresholds, so case selection looks intuitive rather than rule-governed.
  • Selection bias — cases are chosen because the parties were already rivals, and the study then measures how often rivals fight, which presupposes the antagonism it claims to discover.
  • Omitted variables — nuclear weapons, industrial interdependence, satellite reconnaissance and instant communication have altered the costs and the information environment so far that pre-modern transitions are poor guides.
• Its influence is nonetheless real: the phrase organises much of the policy debate on US–China relations, and Chinese officials themselves invoke it when arguing that conflict is avoidable.

The First Decline: Empire and Christian Universalism

Realism requires several sovereigns of comparable strength watching one another. Remove that plurality and the theory has nothing to describe, which is exactly what happened after the first century.

• Pax Romana created a universal state civilisation in which no competing state remained inside the known world.
• The Chinese empire was the other great concentration of power, but the two never interacted in any sustained way, so no inter-imperial balance formed.
• Christianity’s spread completed the eclipse by supplying a rival account of history.
  • Christian universalism held that mankind is one community under one moral law, and that history culminates in the kingdom of heaven.

Machiavelli and the Separation of the Political

• Machiavelli, in The Prince, restored realism by making a strict analytical separation that the tradition has kept ever since.
  • There is a straight division between the internal and the international. The prince owes duties to his own subjects; he owes nothing to those who are not his subjects.
  • The only responsibility of the prince is to preserve his power and protect those under it — everything else is subordinate.
• War, not peace, is the normal condition of world affairs.
  • Every victory, settlement or compromise is only the preparation for the next war; peace is an interval, not an end state.
• On promises and necessity, Machiavelli states the realist position on obligation with unmatched bluntness.

“A prudent ruler cannot keep his word, nor should he, when such fidelity would damage him, and when the reasons that made him promise are no longer relevant.” — Machiavelli

• The moral argument is precise and is often stated too loosely. Machiavelli does not tell the ruler that morality is meaningless; he tells him that a ruler who insists on being good in all circumstances among many who are not good will destroy himself and his state.
  • The ruler must therefore be prepared to act against faith, against charity, against humanity and against religion when necessity requires it — that is, against conventional Christian morality, not against ethics as such.
• Virtù and fortuna are the two forces in his account of political success.
  • Fortuna is chance, circumstance, the unbidden turn of events — Machiavelli’s estimate is that it governs roughly half of what happens.
  • Virtù is the ruler’s capacity — energy, judgement, boldness, adaptability — to seize the other half; it is skill in the face of necessity, not moral virtue.

Hobbes: The State of Nature Between States

• Thomas Hobbes supplied the analytical device that neorealism still runs on: the state of nature, transposed from individuals to sovereigns.
  • Domestically, the Leviathan — the sovereign — ends the war of all against all by holding a monopoly of coercion.
  • Internationally, no such sovereign exists, so states remain in a state of nature towards each other.
  • Internal order is therefore the source of international anarchy: the very act that pacifies the inside creates hard-shelled units that face each other without a common judge.

“In all times kings, and persons of sovereign authority, because of their independence, are in continual jealousies, and in the state and posture of gladiators, having their weapons pointing, and their eyes fixed on one another.” — Hobbes

• Two drivers of rivalry appear in the passage: their independence, which removes any superior, and their jealousy, which is the fear of relative loss.
• Why a Leviathan over Leviathans is impossible is Hobbes’s answer to every proposal for world government.
  • States will not surrender sovereignty, because surrendering it is precisely the vulnerability they exist to prevent.
  • Peoples will not consent either, because they trust their own state with their security and will not transfer that trust to a remote authority.
  • States are, in his account, instruments in the hands of rulers, applied to the purposes of war.
• The asymmetry Hobbes himself noticed is the most underused move in the whole lineage, and it cuts against the simple analogy.
  • Individuals in the state of nature are roughly equally vulnerable — the weakest can kill the strongest in his sleep — which makes that condition intolerable.
  • States are not equally vulnerable. They vary enormously in size, wealth and defensive depth, and a well-armed state can protect its subjects’ industry within its own borders.
  • The international state of nature is therefore more tolerable and more durable than the domestic one, which explains why states have lived in it for centuries without producing a world Leviathan.

The international state of nature persists not because states enjoy it but because, unlike individuals, they can survive it.

The Second Decline and the Westphalian Settlement

• The Thirty Years War ended in the Treaty of Westphalia, generally treated as the foundation of modern international law and the birth certificate of the states system.
• Three principles carried the settlement, and realism inherited all three as its founding architecture.
  • Cuius regio, eius religio — whose realm, his religion. Religion becomes an exclusive internal affair, and fighting over values rather than material interest is put out of bounds.
  • Sovereign equality — every king is emperor in his own kingdom; all states are formally equal and independent, however unequal in capability.
  • Balance of power — no one may become stronger than the rest, and when one power bids for mastery the others combine to resist. The Napoleonic wars and both world wars are read as the mechanism operating.
• Why realism receded again: Enlightenment confidence in progress, commerce and law turned power politics into practice rather than theory, and it returned as a discipline only when the First World War discredited that confidence.

Two Precursors the Standard Lineage Omits

• Rousseau’s stag hunt supplies the collective-action form of the security dilemma, and it is a sharper statement of the problem than the state-of-nature analogy.
  • Five hunters can catch a stag and eat well only if all five hold their positions.
  • A hare passes one hunter, who can take it and feed himself alone; he defects, and the stag escapes.
  • The defection is not wickedness but rational distrust — he cannot be sure the others will hold, so the safe individual choice destroys the superior collective outcome.
  • This is why cooperation fails even among states with entirely benign intentions, which is precisely the neorealist claim.
• Max Weber’s distinction between two political ethics gave realism its moral vocabulary.
  • The ethic of conviction judges an act by the purity of the intention behind it and accepts whatever follows.
  • The ethic of responsibility judges an act by its foreseeable consequences, and holds the statesman answerable for those consequences even when his motives were good.
  • Realists — Morgenthau explicitly — adopt the ethic of responsibility, which is how they insist both that politics has a morality and that universal rules cannot govern states in the abstract.

Realism in the East: Kautilya

Kautilya’s Arthashastra is the most complete pre-modern statement of realist statecraft anywhere, and it is systematically underweighted in Western accounts of the lineage. It is not a work of moral philosophy that concedes the need for force; it is a manual of state power in which the ruler’s obligation to expand and secure the realm is the organising premise.

• Matsya nyaya — the law of the fish, in which the big fish eats the small — is the Indian statement of anarchy.
  • Without danda, the rod of punishment, the strong devour the weak; the state exists to end this condition internally, and between states the condition persists.
• The vijigishu is the would-be conqueror, the aspiring universal sovereign, and he is the analytical centre of the text.
  • He is ever hungry to acquire power, because a state that is not expanding is decaying — Kautilya admits no stable equilibrium.
• The mandala theory arranges the world in concentric circles around the vijigishu and derives enmity from geography rather than from sentiment.
  • The immediate neighbour is the natural enemy — contiguity produces friction over territory, water and trade.
  • The neighbour’s neighbour is the natural friend, because he presses on the enemy from the other side.
  • The circles alternate outward — enemy, friend, enemy’s friend, friend’s friend — producing a structural map of alignment.
  • Other positions include the madhyama, the middle king strong enough to affect either side, and the udasina, the indifferent or neutral king stronger than both.
  • This is a structural theory of alliance in which relationships follow from position, not from shared values — the same logic Waltz would later derive from anarchy.
• The saptanga theory identifies seven constituent elements (prakritis) of the state, an early inventory of national power.
  • Swami the ruler; amatya the ministers and bureaucracy; janapada the territory and population; durga the fortified capital; kosha the treasury; danda the army; and mitra the ally.
  • The order is deliberate: each element is more important than those following, and the ally comes last — external support is the least reliable of the seven, which is self-help stated as doctrine.
• The four upayas are the instruments of policy, arranged from the cheapest to the most costly.
  • Sama — conciliation, persuasion, negotiation.
  • Dama — gifts, inducement, purchase of compliance.
  • Bheda — division, dissension, splitting the adversary’s coalition from within.
  • Danda — force, punishment, war, to be used when the first three fail.
  • The sequence is an early escalation ladder, and bheda in particular anticipates subversion and covert action as ordinary instruments of statecraft.
• The shadgunya — the six-fold policy — is the menu from which the king selects according to relative strength.
  • Sandhi peace or treaty, when weaker; vigraha hostility, when stronger; asana neutrality or keeping quiet; yana marching or preparing for war; samshraya seeking shelter with a stronger king; and dvaidhibhava the dual policy of peace with one while warring on another.
  • The selection rule is explicitly calculative: the king compares power, place and time, not right and wrong.
• What makes Kautilya distinctive is that ethics is not abandoned but subordinated and internalised.
  • The king’s rajadharma binds him to the welfare of his subjects — in the happiness of his subjects lies the king’s happiness is the text’s own standard.
  • Ruthlessness outward is licensed by responsibility inward, which is closer to Weber’s ethic of responsibility than to amoralism.

Sun Tzu and the Chinese Strategic Tradition

• Sun Tzu’s The Art of War, written at roughly the same time as Thucydides’ history, is the other Eastern founding text and it reaches different conclusions from the same premises.
• Winning without fighting is the central maxim: to subdue the enemy without battle is the supreme excellence.
  • The hierarchy runs attack the enemy’s strategy first, then his alliances, then his army, and only last his cities — a preference ordering that puts diplomacy and coalition-breaking above combat.
• Deception is the constant theme — all warfare is based on deception; appear weak when strong, distant when near.
• How it differs from the Western tradition is worth stating precisely rather than blurring the two.
  • Western realism from Thucydides to Mearsheimer treats conflict as structural and largely unavoidable; Sun Tzu treats victory as manageable by superior calculation.
  • The Western line is explanatory — it says why war recurs; Sun Tzu is prescriptive — he says how to win cheaply.
  • Where Clausewitz makes decisive battle the object, Sun Tzu makes battle the admission of failure.

Precursor	Core insight	What later realism took from it
Thucydides	Fear of a rising power drives the established power to war	Power transition; unknowability of intentions
Machiavelli	Internal and international are separate moral spheres; war is normal	Autonomy of politics; consequentialist ethics; virtù
Hobbes	No common sovereign means a permanent posture of war	Anarchy as the ordering principle; impossibility of world government
Rousseau	Rational distrust defeats a superior collective outcome	The security dilemma as a collective-action problem
Weber	Responsibility, not conviction, is the statesman’s ethic	Realism’s moral position under criticism
Kautilya	Neighbours are enemies by position; the king must expand	Structural alliance theory; elements of national power; escalation ladder
Sun Tzu	Subdue the enemy without fighting; deception and information decide	Strategy, intelligence, coalition-breaking

The Core Assumptions of the Realist Theory

Every realist variant, however much it disagrees about the source of conflict, accepts a small set of premises about what the international world is made of. Stated together they amount to a state-centric world view — the proposition that world politics is what states do to one another, and that everything else is derivative.

The Six Standing Features

• State-centrism. The state is the pre-eminent actor; sovereignty makes it independent and autonomous, inside and outside its borders.
  • Non-state actors — multinational corporations, non-governmental organisations, the United Nations — are relegated to peripheral status.
  • Realists concede that such actors operate, but insist they do so with the consent of national political authorities, inside rules states wrote. Nothing is above the state.
• Anarchy. International politics has no common government above states — this means absence of a superior authority, not chaos or disorder.
• Self-help. With no world government to appeal to, security depends on a state’s own resources; relying on others is imprudent.
• Survival. Survival is the fundamental national interest and the precondition of every other goal — economic prosperity and welfare are low politics, security is high politics.
• Power. In anarchy the only route to survival is accumulating power, so international politics becomes a struggle for power.
• The security dilemma. Because power is treated as zero-sum, one state’s increase in strength is automatically another’s loss.
  • The second state feels insecure, arms in response, and both end up no more secure than before — but poorer, and more afraid.

The Three S’s

• Statism — the state at the centre of world politics, with other actors treated as proxies for state interests rather than independent forces.
• Survival — the single purpose that drives state action, and the interest that makes all others negotiable.
  • Kissinger’s formulation is the sharpest: a nation’s survival is its first and ultimate responsibility, and cannot be compromised or put at risk.
• Self-help — the best and perhaps the only option available in an anarchic system.
  • Realised through internal balancing (armament, economic and industrial mobilisation) and external balancing (alliances).
  • Alliances are instruments of convenience, dissolved when the threat that produced them disappears.

Groupism, Egoism and Power-Centrism

William Wohlforth’s restatement compresses realism into three propositions and is more portable than the six-feature list, because it does not presuppose the modern state.

• Groupism — politics happens within and between groups, and group solidarity is essential to survival; today the decisive group is the nation-state, but the logic predates it and would survive it.
• Egoism — when individuals and groups act politically, they are driven by narrow self-interest more reliably than by any wider loyalty.
• Power-centrism — because resources are unequally distributed and there is no authority above the group, power is the fundamental feature of politics, and inequalities of power shape every outcome.

Rationality

• States are treated as rational, unitary actors — they rank preferences and choose the means best suited to their ends.
  • Unitary means the state is analysed as a single decision-maker, so bureaucratic bargaining and coalition politics are set aside.
  • Rational means instrumental rationality, not wisdom: a state may pursue disastrous ends efficiently.
• The assumption is methodological, not empirical. Realists do not claim statesmen never blunder; they claim that a model assuming calculation predicts aggregate behaviour better than one assuming caprice.

Realism’s assumptions are austere by design: a theory that explains a great deal from very little is worth more than one that explains everything after the fact.

Classical Realism

Classical realism is a whole world view rather than a model — a tradition running from Thucydides and Machiavelli through E. H. Carr to Hans Morgenthau, the most influential figure in post-war realism. Its distinguishing commitment is that the struggle for power is rooted in human nature, and is therefore permanent, so that justice, law and society are either absent from international politics or severely circumscribed within it.

E. H. Carr as a Realist Theorist

• Carr’s The Twenty Years’ Crisis set up the field’s founding opposition between utopianism and realism as two permanent tempers of political thought.
  • Utopianism is the temper of aspiration — it describes what ought to be and mistakes the description for analysis; it is voluntarist, believing that will and reason can remake the world.
  • Realism is the temper of analysis — it accepts the given and studies causes and consequences.
  • Carr’s own position is that a sound political science needs both, and that each temper is dangerous when it monopolises the field.
• The harmony of interests is an ideology of satisfied powers — Carr’s most durable single contribution.
  • The claim that the true interests of all states coincide is offered as a universal truth but functions as a defence of the status quo.
  • Peace is thus itself a partisan interest — the interest of powers that already have what they want.
• His warning against pure realism is the part of Carr that realists themselves tend to forget, and it distinguishes him sharply from Morgenthau.
  • A consistent realism, Carr argues, excludes finite goals, emotional appeal, a right of moral judgement and a ground for action — everything that makes political life possible.
  • Pure realism is therefore sterile: it can expose an ideology but cannot supply one, and a theory that leaves no room for purposive action cannot guide a statesman.
  • Carr is best read as a realist critic of realism’s own pretensions, which is why he sits uneasily inside the school he helped found.

Morgenthau: Context and the Six Principles

• The context of Politics Among Nations explains its tone. Morgenthau wrote as the United States emerged victorious and dominant.
  • Victors, he observed, tend to develop pity for the vanquished and a taste for moral crusading, and both distort judgement.
  • The six principles were written to warn American policymakers against post-victory idealism, and he called them scientific principles deliberately, to claim for realism the authority of a science.
• Principle one — politics is governed by objective laws rooted in human nature.
  • Man is animus dominandi, a power-seeking animal, and the lust for domination is a constant of the species.
  • Since states are run by human beings, states are power-seeking too; international politics is only politics conducted on a larger stage.
• Principle two — the main signpost is interest defined in terms of power.
  • Just as individuals act on self-interest, nations act on national interest, and the fundamental national interest is survival.
  • Power is the only means of securing it, which yields the tradition’s most quoted line.

“International politics, like all politics, is a struggle for power. Whatever the ultimate aims of international politics, power is always the immediate aim.” — Morgenthau

• Principle three — interest is a universal category but its content is dynamic.
  • National interest is the permanent motivation, but what it consists of changes as the world order changes, so states must continually revise it.
• Principle four — universal moral principles cannot be applied to state action in their abstract formulation.
  • Following Machiavelli, Morgenthau holds that abstract morality cannot govern statecraft; moral rules must be filtered through the concrete circumstances of time and place.
  • Prudence — weighing the consequences of alternative political actions — is the supreme virtue in politics, and it is a moral virtue, not the absence of one.
• Principle five — the moral aspirations of a particular nation are not the moral laws of the universe.
  • Ideology is a mask for real intentions; nations dress interest in the language of universal principle.
  • A state that mistakes its own preferences for universal morality becomes a crusader, and crusades end in disaster because they admit no compromise.
  • He therefore advised that a state should keep its ideas, ideologies, norms and values out of its dealings with other states.
• Principle six — the political sphere is autonomous.
  • International politics is neither ethics, nor law, nor economics; it has its own rules and its own standard of judgement, which is the interest of the political community.
  • The economist asks how a policy affects wealth, the lawyer whether it conforms to rule, the moralist whether it is right; the political realist asks how it affects power.
  • Morgenthau conceded that this is not an inspiring field of study, but insisted that it is how the world works.

The Dual Nature of Power and Morgenthau’s Working Concepts

• Power is both means and end, and this dual nature is the theoretical heart of the six principles.
  • As a means, power secures the interests a state has independently.
  • As an end, power is pursued for its own sake, because more of it is always safer.
  • Power is a relationship, not a possession — man’s control over the minds and actions of other men — which means it is exercised only in relation to another actor.
• The elements of national power give the concept content and prevent it collapsing into military hardware.
  • Geography, natural resources, industrial capacity, military preparedness, population, and national character with national morale.
  • The quality of diplomacy is the element Morgenthau rated highest — the factor that binds all the others into a coherent whole and can multiply or waste them.
• Three types of foreign policy follow from a state’s relation to the existing distribution of power.
  • Status quo policy — pursued by states that benefit from the present arrangement and wish to keep it; the United States after 1945 is the standard illustration.
  • Imperialistic policy — the deliberate attempt to overturn the existing distribution of power, whether by military, economic or cultural means; Germany under Hitler is the type case.
  • Policy of prestige — the demonstration of power through diplomatic ceremony and displays of force, which is auxiliary to the first two rather than parallel to them.
  • Later renderings replace prestige with a category of revisionists — states seeking to change a system that does not favour them, with a rising China placed there; the substance is Morgenthau’s imperialism in contemporary dress.
• On the instruments of order, Morgenthau was consistently sceptical of law and institutions.
  • He saw no real role for international organisations or international law as independent constraints on great powers, since both depend on the power that made them.
  • Balance of power, diplomacy and deterrence are the mechanisms he trusted: the first an automatic tendency of a multi-state system, the second the art of accommodating interests short of war, the third the nuclear-age form of the first.
  • His prescription for peace was therefore peace through accommodation: diplomacy that defines national interests in terms compatible with those of others, not law that pretends to override them.

Criticism of Morgenthau

It is sometimes said that the theory of international politics is a continuing dialogue between Morgenthau’s supporters and his critics — and the critics come from inside realism as much as from outside it.

• Waltz: the theory is not scientific. A theory built on human nature cannot be scientific, because human nature is constant and a constant cannot explain variation.
• The liberal objection to the anthropology. The pessimistic account of human nature is asserted rather than demonstrated, and it ignores the cooperative strain that is equally visible in human conduct.
• Benno Wasserman put the point most precisely: Morgenthau’s description of human nature is not scientific — it is a philosophical postulate carrying the weight of an empirical finding.
• Stanley Hoffmann on monocausality. Morgenthau reduces the whole of international life to a single factor, power, exactly as economic determinism reduces it to one factor.
  • Monocausal theories buy elegance with explanatory loss, and cannot account for outcomes that power alone does not predict.
• The circularity problem is the most damaging technical objection.
  • If power is both the means and the end, then any behaviour whatever can be redescribed as the pursuit of power.
  • A theory that no observation can contradict is unfalsifiable, and therefore not the science Morgenthau claimed.
• Conceptual vagueness of “interest defined as power.”
  • Both terms are abstract and imprecise, and critics argue that Morgenthau built the theory’s ends and means out of two categories he refused to specify.
  • His defence was that political action is not finite or precisely observable, so concepts must be as hazy as the reality they reflect — a defence that concedes the point.
  • In practice, the national interest is assumed rather than defined, so it becomes a licence for whatever the powerful choose to do, and those who rule may pursue their own or their class’s interest under its name.
• The feminist critique is a major line of attack: J. Ann Tickner has reformulated all six principles, arguing that Morgenthau’s human nature, his conception of interest and his separation of politics from ethics are gendered constructions rather than objective laws.

Structural Realism, or Neorealism

Why the Shift from Human Nature to Structure

• Neorealism keeps classical realism’s conclusions and abandons its method. On the basic assumptions about international politics there is no quarrel; the quarrel is about how those assumptions are grounded.
• Human nature cannot be a scientific foundation, for two reasons that between them are decisive.
  • It is unpredictable — the same person need not behave alike twice in similar circumstances — so it generates no testable expectations.
  • It is constant, and a constant cannot explain variation — if human nature is the same in 1815 as in 1945, it cannot explain why one period produced general war and the other did not.
• Kenneth Waltz therefore changed the level of analysis, moving from actor-level or unit-level explanation to structure-level explanation.
  • Structure means the fundamental architecture of a system — the arrangement of its parts, which persists while the parts change.

The Context of Waltz’s Theory

• Waltz is often called a détente realist. During the relaxation of superpower tension, liberal scholars — notably Robert Keohane and Joseph Nye — challenged realism’s claim to be the scientific theory of international politics.
• His aim was to re-establish realism as timeless wisdom, valid whatever the temperature of a given decade.
• Theory of International Politics appeared in 1979, the year the Cold War visibly returned — a coincidence that did the theory’s reputation no harm.

The Three Elements of Structure

• Ordering principle: anarchy. The international system is ordered by the absence of a common government, which is not the same as disorder.
  • Domestic politics is hierarchical — a state exists, so individuals need not arm themselves for protection.
  • International politics is anarchical — no state exists above states, so each has no option but to acquire arms.
  • The consequence is automatic: the structure itself creates the security dilemma, and international politics becomes a struggle for power whether or not anyone wants it to.
• Absence of functional differentiation among units. Domestically, functions are divided — executive, legislature, judiciary each do something different.
  • Internationally, all states must perform the same basic functions; none can specialise in defence and leave security to another.
  • States are therefore like units, differing not in kind but in degree.
• Distribution of capabilities: the only variable that changes. States differ in capabilities, meaning the amount of power they hold.
  • Capabilities are ranked across size of population and territory, resource endowment, economic capability, military strength, political stability and competence.
  • Capabilities determine polarity — unipolar, bipolar, multipolar — and polarity is the one structural feature that varies, so it must carry the theory’s explanatory weight.

What Follows from the Structure

• The security dilemma was named by John Herz and, independently, by Herbert Butterfield, and it is the mechanism that links anarchy to conflict.
  • Herz’s version: measures a state takes for its own security reduce the security of others, who respond in kind, leaving everyone less secure.
  • Butterfield’s version adds the tragedy — the dilemma operates even between states that mean each other no harm, because neither can enter the other’s counter-fear.
• Self-help is the necessary principle of action in such a structure — Waltz’s phrase is that in an anarchic structure, self-help is necessarily the principle of action.
• Relative gains distinguish realists from liberals more sharply than any other single concept.
  • A state must ask not only do I gain but do I gain less than my rival, because today’s economic partner may be tomorrow’s adversary.
  • Joseph Grieco made this the core neorealist reply to neoliberal institutionalism, identifying two barriers to cooperation: fear of cheating, and concern about the distribution of gains.
• Balancing is the system’s recurrent behaviour, and it happens whether or not anyone intends it.
  • Internal balancing — building up one’s own military and economic strength.
  • External balancing — forming or joining alliances against the stronger side.
  • Waltz’s claim is that balances form irrespective of the intentions of any state; they are outcomes of the structure, not achievements of statecraft.
  • All realists agree that a balance is not a stable condition — it eventually breaks down, in war or in peaceful change, and is replaced by a new one.
• Bipolarity is more stable than multipolarity — Waltz’s most contested corollary.
  • Fewer dyads means fewer relationships to manage and fewer opportunities for miscalculation.
  • Multipolar systems generate chain-ganging and buck-passing — being dragged into an ally’s war, or hoping someone else will do the balancing.
• Structure constrains choice, with a large consequence for the study of foreign policy.
  • Whoever occupies the office is compelled towards power politics; the identity of the decision-maker drops out, which is the elimination of the personality factor.

Balance of Threat: Stephen Walt’s Amendment

Stephen Walt identified a straightforward empirical problem with Waltz’s account: states plainly do not always balance against the strongest power. Western Europe allied with the far more powerful United States against a weaker Soviet Union. Walt’s answer is that states balance not against power but against threat, and threat is a compound of four things.

• Aggregate power — total resources: population, industry, technology, military capability. This is Waltz’s variable, retained but demoted to one factor among four.
• Geographic proximity — power projects less well over distance, so nearby strength is more threatening than distant strength. Oceans are a reason states across them are tolerated.
• Offensive capability — the portion of a state’s power actually usable for attack. A large army configured for territorial defence threatens less than a smaller expeditionary force.
• Perceived intentions — the most contested element, because it readmits perception, ideology and reputation, which Waltz’s austere structuralism had excluded.
• What it buys and what it costs. Balance of threat explains alliance patterns that balance of power gets wrong, but the price is parsimony — once intentions matter, the theory needs information about what is inside states.

Defensive Realism

• Defensive realism is the broader family to which Waltz belongs; its claim is that the international system rewards moderation and punishes expansion.
• Robert Jervis supplied its theoretical core with the offence–defence balance.
  • When technology and geography favour the defence, security is abundant, the security dilemma is mild, and states can afford restraint.
  • When they favour the offence, conquest looks feasible, fear rises sharply, and even status quo states behave aggressively.
  • Jervis added that the dilemma is worst when offensive and defensive weapons are indistinguishable, since no state can then signal benign intent by its armaments.
  • He also worked out the spiral model against the deterrence model: sometimes firmness prevents war, sometimes it causes it, and the statesman’s problem is that he cannot always tell which situation he is in.
• Jack Snyder explained why states nonetheless over-expand: myths of empire propagated by narrow domestic coalitions — logrolling among military, industrial and imperial interests — persuade states that expansion is safe when it is not.
• Stephen Van Evera developed the cult of the offensive, arguing that militaries systematically overestimate the advantages of attacking, and that this belief, rather than the actual balance, drove Europe into the First World War.
• The common thread: expansion provokes counter-coalitions and is self-defeating, so the prudent state acquires the power sufficient for its defence and stops.

	Classical realism (Morgenthau)	Neorealism (Waltz)
Level of analysis	Unit or actor level	System or structure level
Source of conflict	Human nature — animus dominandi	Anarchy and the distribution of capabilities
Method	Historical, philosophical, interpretive	Deductive, parsimonious, modelled on economics
Role of the statesman	Central — prudence and skill decide outcomes	Marginal — structure constrains, personality drops out
Power	An end in itself, sought by human appetite	A means to security; capability is what matters
View of morality	Politics has its own ethic; prudence is a virtue	Largely silent; the theory is explanatory, not normative
Change in the system	Shifts in national power and skill of diplomacy	Only a change in the distribution of capabilities
Foreign policy	The theory advises statesmen directly	A theory of international politics, not of foreign policy
Key text	Politics Among Nations (1948)	Theory of International Politics (1979)

Waltz’s achievement was to make realism independent of any claim about what human beings are like — and his critics have spent forty years arguing that the independence is only apparent.

Offensive Realism

Mearsheimer’s Context

• The end of the Cold War put realism’s claim to timeless wisdom in doubt. International institutions, regional organisations and global conventions multiplied, the World Trade Organization was founded in 1995, and globalisation deepened interdependence.
• The conclusion widely drawn was that power politics had lost its relevance — that states need no longer worry about arms races and could pursue cooperation instead.
• John Mearsheimer’s The Tragedy of Great Power Politics (2001) answered that conclusion, and its subject is the future of US–China relations.
  • He warned against the fantasies of American scholars who expected cooperation, and prescribed three positions: China challenges American primacy; assisting its rise would be foolish; and the discourse of a peaceful rise should not be accepted.
  • His judgement was that China seeks power not for security but for dominance, that the power gap is closing faster than any comparable rise in history, and that the sooner containment begins the better.

The Five Bedrock Assumptions

• The system is anarchic — no authority above states.
• Great powers possess some offensive military capability, so each can hurt the others.
• States can never be certain of another’s intentions, and intentions can change overnight even if they are known today.
• Survival is the primary goal of every state.
• States are rational actors, capable of strategic calculation about their environment.
• What the five together generate is the argument’s engine: none of them is pessimistic on its own, but combined they produce fear, self-help and power maximisation as the only prudent responses.
  • The result is tragedy rather than villainy — great powers compete not because they are wicked but because the structure gives them no safe alternative.

Power Maximisation and the Stopping Power of Water

• States are power maximisers, not security maximisers. Since intentions are unknowable and mutable, the only reliably safe position is preponderance, and no amount of power is therefore enough.
  • On this Mearsheimer stands closer to Morgenthau than to Waltz: for both, power is an end in itself.
  • Offence is the best defence; historically, he argues, states taking offensive action have won more often than those waiting to be attacked.
• The stopping power of water explains why the pursuit stops short of world domination.
  • Large bodies of water make cross-ocean conquest and occupation prohibitively difficult, so no state can dominate the globe.
  • States therefore aim at regional hegemony and, having achieved it, work to prevent any other state achieving it in another region — which is Mearsheimer’s account of United States policy since 1898 and of its posture towards China now.

The Policy Menu

• Direct action — two methods, both applied by the state itself.
  • War — effective, but extremely costly.
  • Blackmail — coercive threat short of war; cost-effective, but frequently fails against a determined opponent.
• Indirect action — three methods, all of which shift the cost onto others.
  • Buck-passing — getting another state to bear the burden of containing the threat. From Washington’s perspective India is the ideal swing state for passing the China buck in Asia.
  • Bait and bleed — manoeuvring two rivals into a protracted war while standing aside; the pattern of backing the weaker party, as in support for Pakistan against India, India against China, Saudi Arabia against Iran.
  • Bloodletting — where two states are already fighting, ensuring the war continues so both are weakened. Supplying arms to both sides in the Iran–Iraq war, so that neither emerged as the regional power, is the standard illustration.
• Balancing and appeasement complete the menu as the remaining responses to a rising threat.
  • Balancing — taking on the burden directly, by internal build-up or by alliance; costly but reliable.
  • Appeasement — conceding to the rising power in the hope of moderating it. Mearsheimer treats it as almost always mistaken, since concessions shift the balance further in the aggressor’s favour.

	Waltz — defensive realism	Mearsheimer — offensive realism
How much power is enough?	An appropriate amount; enough for defence	As much as obtainable; hegemony is the only guarantee
Why	Excess power provokes counter-coalitions and is self-defeating	Intentions are unknowable and can change, so only preponderance is safe
What states maximise	Security	Relative power
How war-prone is the system?	Moderately; the dilemma can be mitigated by signalling and defensive advantage	Strongly; great-power competition is tragic and unavoidable
Response to a bid for hegemony	Others form counter-coalitions and balance	Others may prefer bandwagoning and join the stronger side
Prescription	Prudence, restraint, avoiding provocation	Maximise relative power; secure regional hegemony, deny it to others
Key text	Theory of International Politics (1979)	The Tragedy of Great Power Politics (2001)
Reading of China’s rise	Balance China without triggering encirclement fears	Competition follows regardless of Chinese intentions; contain early

• How to test the disagreement. Germany before 1914 and Japan before 1941 support the defensive reading, since expansion produced the coalitions that destroyed both. American behaviour after 1945, and the present competition with China, fit the offensive reading better.
• The critique of offensive realism is that it cannot explain peaceful change between great powers — the Anglo-American transition of the last century is the standing counter-example — nor the pooling of sovereignty in the European Union.

Neoclassical Realism

Gideon Rose named the school, reviewing a group of authors who were re-admitting domestic politics into realist explanation without abandoning its structural premise. The argument is a division of labour between levels: structure sets the range of possible responses, and what a state actually does inside that range depends on what is happening inside it.

• The causal chain: systemic pressure is the independent variable; domestic factors are intervening variables; foreign policy is the outcome.
• The intervening variables are four, and each has a literature.
  • Leaders’ perceptions — decision-makers respond to the structure they believe they are in, not the one an analyst can measure. William Wohlforth developed this on the Cold War’s end.
  • State strength relative to society — Fareed Zakaria argued that national power becomes usable only when the state can draw on it, which is why the United States expanded decades after it became rich.
  • Domestic coalitions and elite consensus — Randall Schweller explained underbalancing: fragmented elites and divided societies fail to balance against threats that structural theory says they should.
  • Extractive capacity — the state’s ability to convert national wealth into military and diplomatic instruments; Lobell, Ripsman and Taliaferro systematised this into the school’s standard framework.
• Why it is the most useful realist frame for practical analysis: it is the only variant that can explain divergent responses to identical structural conditions.
• The charge against it is that the gain is bought too dearly.
  • It sacrifices parsimony, the very quality that made Waltz’s theory attractive.
  • Adding intervening variables after the fact risks ad hoc explanation — a theory that accommodates any outcome once domestic detail is supplied predicts nothing in advance.

Post-Colonial Realism: Ayoob and the Insecurity Dilemma

• Mohammed Ayoob’s subaltern realism begins from the observation that realism’s central concepts were built from European history and travel badly to states created by decolonisation.
• The insecurity dilemma is his central reformulation, and it inverts the classical problem.
  • The security dilemma describes states threatened from outside by other states’ armaments.
  • The insecurity dilemma describes states threatened from inside — by insurgency, secession, ethnic and communal conflict, contested legitimacy and the weakness of institutions.
  • For most post-colonial states, the principal threat to the state is internal, so a theory keyed to external attack misdescribes their predicament.
• State-making is a violent process, and this is the argument’s historical core.
  • European states took centuries to consolidate, through war, coercion and the suppression of rival authorities; they did so before mass politics and before an international order that scrutinises the process.
  • Post-colonial states must complete the same task in decades, with inherited borders they did not draw, under external human-rights scrutiny, and with populations already politically mobilised.
• The regional implication follows: weak states are absorbed by their immediate neighbourhood, so their security concerns are regional rather than systemic, and global-power theorising captures little of what drives them.
• Why it is a realist variant. Ayoob keeps the state as the unit, security as the organising value and power as the currency; he relocates the threat.

Criticism of Realism as a Whole

• The five charges against structural realism are the standard indictment.
  • Domestic politics is excluded entirely — the structure is said to leave no scope for it, which is empirically implausible.
  • System-level explanation cannot reach foreign policy — decision-making, bureaucratic process and political culture fall outside a theory that treats states as identical units.
  • The focus on security is too narrow, leaving the theory poorly equipped for economic relations, which it can only read as security by other means.
  • The Cold War’s peaceful end was neither predicted nor easily accommodated: a superpower dismantled itself without defeat, which no structural logic anticipated, and the resulting conceptual crisis was the sharpest realism has faced.
  • Indeterminacy of balancing — the theory predicts that balances will form, but not when, by whom, against which state, or by what means, so almost any outcome can be recorded as confirmation.
• The international-society critique, from Martin Wight and the English School, is that realism is one-dimensional.
  • Realism is one-dimensional, ignoring the cooperative strain in human conduct and the extent to which international relations form an anarchical society, not merely an anarchical system — states share interests, observe common rules and recognise mutual rights and duties.
• The liberal counter is empirical: realism cannot explain the century of peaceful Anglo-American accommodation, nor the European Union, in which states have pooled sovereignty rather than balancing one another.
• The emancipatory critique, from Ken Booth, argues that the realist security game of threats, counter-threats and alliances is obsolete: insecurity is now generated inside disorganised and failing states and felt by individuals, so emancipation, not power or order, produces true security.
• The constructivist reply is that anarchy has no fixed logic — its meaning depends on the shared understandings states build, so self-help is a practice rather than a structural necessity.
• The Marxist reply is that the unit is wrong: the primary structure is the world capitalist economy and the primary actors are classes, so the inter-state competition realism describes is a surface effect.
• The feminist critique holds that realism’s categories — autonomy, sovereignty, rational calculation, security as territorial defence — encode a masculine standpoint presented as objectivity.
• The post-modern critique treats realism as a discourse that manufactures the necessity it claims to discover: by narrating anarchy as a permanent condition, it makes the practices that reproduce anarchy appear inevitable.

The Relevance of Realism Today

• February 2022 restored realism to the centre of both scholarship and policy commentary. The full-scale invasion of Ukraine and intensifying US–China competition returned territorial conquest, alliance formation and deterrence to the questions the discipline has to answer.
• The NATO-enlargement dispute is the decade’s most-cited and most-contested realist argument, and it is best presented as an unresolved controversy.
  • Mearsheimer’s case is that Western policy — enlargement, association agreements and democracy promotion — encroached on a great power’s recognised sphere and made a violent response predictable, whatever Russia’s domestic character.
  • The rebuttals are three: the account denies Ukrainian agency, treating a sovereign state as terrain; it treats enlargement as something done to Eastern Europe rather than sought by the states that joined; and it reads motives from structure while ignoring the ideological content of Russian revisionism.
  • A fourth objection is internal: on Mearsheimer’s own premises, credible deterrence on Russia’s border should have discouraged, not triggered, invasion — and his own explanation leans on regime type and status denial, which structural realism is not entitled to use.
• US–China competition and power transition is the second live theatre, where the Thucydides Trap organises the debate and the criticisms of that thesis discipline it.
• The return of economic statecraft is realism’s clearest vindication in practice: export controls on advanced semiconductors, screening of inbound and outbound investment, industrial policy, friend-shoring and the competition for critical minerals are all relative-gains behaviour by states that spent three decades insisting absolute gains were what mattered.
  • Economic interdependence, on this reading, is not a solvent of conflict but a map of vulnerabilities to be managed, which is what states are now doing.
• The nuclear domain supplies the starkest datum: with New START having expired in February 2026, the principal treaty constraint on the two largest arsenals has lapsed, and both sides return to unconstrained self-help in exactly the way structural realism expects when no authority stands above the parties.
• The honest qualification. Realism explains competition better than it explains order.
  • It has no good account of why the European Union exists, why the democratic peace holds, or why the nuclear taboo has survived direct testing.
  • A theory that predicts only the recurrence of conflict is confirmed by the news without ever being tested by it.

Realism’s revival is a measure of the world’s condition rather than a demonstration of the theory’s truth — which is exactly the difficulty with a theory whose evidence is disorder.

The Indian Anchor

• Kautilya remains India’s own realist foundation, and Indian strategic writing returns to the mandala and shadgunya whenever it argues that neighbourhood policy must be read as position rather than sentiment.
• Nuclear doctrine is classical realist reasoning applied. Credible minimum deterrence and no first use, with assured massive retaliation, accept that survival is the fundamental interest, that self-help secures it, and that deterrence is the nuclear-age form of the balance of power — while rejecting the power maximisation an offensive realist would counsel.
• The 1971 Treaty of Peace, Friendship and Cooperation with the Soviet Union is textbook external balancing: a non-aligned state contracting a security guarantee when a rival’s alignment with two great powers made the regional balance intolerable.
• Strategic autonomy and multi-alignment are read differently by each realist variant, and the differences are instructive.
  • The classical realist reads them as hedging — a prudent statesman refusing to convert a partnership into a commitment while the distribution of power is unsettled.
  • The neorealist reads them as structurally compelled — a rising power in a system with one declining hegemon and one rising challenger will avoid entrapment until the polarity settles.
  • The offensive realist reads them as capability accumulation — accepting technology, capital and arms from several quarters while conceding nothing, on the way to regional primacy.
  • The neoclassical realist reads them as domestically mediated — the same structural pressure produces this policy because of India’s extractive capacity, coalition politics and an elite consensus inherited from non-alignment.
• The Quad without an alliance is the emblematic case: security cooperation with the United States, Japan and Australia that stops short of a mutual-defence commitment, alongside continued Russian defence and energy ties and simultaneous participation in the Shanghai Cooperation Organisation and BRICS.
• Operation Sindoor, May 2025, is a security dilemma in operation. Following the Pahalgam attack of 22 April 2025, India struck across the border and placed the Indus Waters Treaty in abeyance — the one functional-cooperation instrument that had survived three wars — where it remained through 2026.
  • Both sides read the other’s preparations as offensive; both escalated to demonstrate resolve; and the cooperative instrument was the first casualty, which is precisely the sequence realist theory predicts when the political dispute is prior to the cooperation.
• Kanti Bajpai’s classification organises Indian strategic thought into three streams, and each maps onto a position in this debate.
  • Nehruvianism — conflict arises from misperception and mistrust; dialogue, institutions and norms can reduce it; military power has limited utility.
  • Neoliberalism — economic strength is the foundation of power, and growth and trade both enrich and pacify.
  • Hyperrealism — international politics is a struggle for dominance, force is the only reliable currency, and India must build and be willing to use hard power.
  • The record sits between them, which is why neoclassical realism describes Indian foreign policy better than any single structural account.