What do you mean by offensive and defensive realism? (2023, 15 Marks)
Offensive and defensive realism are the two branches of structural realism. Both accept that anarchy, the absence of authority above states, forces them into self-help. They split on one question: how much power is enough? The answer decides whether great-power rivalry is permanent or can be contained by restraint.
Shared ground
- States are rational, unitary actors whose first goal is survival.
- Intentions are uncertain, so states watch capabilities and fear the security dilemma named by John H. Herz (1950): one side’s defensive build-up looks threatening to another and invites an arms race.
- Both care about relative gains. Joseph M. Grieco (1988) called states “defensive positionalists” who refuse deals that leave a rival stronger. Defensive realism is therefore not a theory of absolute gains; the two differ on how far a state should push its relative advantage.
Offensive realism
- John J. Mearsheimer‘s The Tragedy of Great Power Politics (2001) rests on five assumptions: anarchy, offensive capability, uncertain intentions, survival as the primary goal, and rationality.
- Together they make great powers power-maximisers: since any rival may turn hostile, only hegemony guarantees survival, so states are rarely satisfied with the status quo.
- The stopping power of water rules out global hegemony, so the goal becomes regional hegemony while denying it to rivals elsewhere.
- Threatened states balance or buck-pass; bandwagoning is left to weak states. Competition is structural and tragic, not the fault of wicked leaders.
Defensive realism
- Kenneth N. Waltz held that states seek “not to maximize power but to maintain their positions in the system” (Theory of International Politics, 1979).
- Excess power is self-defeating because it provokes counter-balancing coalitions.
- Robert Jervis‘s offence–defence balance (1978) shows that when defence is advantaged, security is cheap and restraint is rational.
- Stephen M. Walt adds that states balance against threat: aggregate power, proximity, offensive capability and perceived intentions.
- Jack Snyder and Stephen Van Evera trace over-expansion to domestic myths and military biases, not to structure.
| Criterion | Offensive realism | Defensive realism |
|---|---|---|
| States maximise | Relative power | Security |
| Enough power | Regional hegemony | Sufficient for defence |
| Expansion | Often pays | Usually backfires |
| Typical response | Balancing, buck-passing | Balancing against threat |
| Prescription | Seize opportunities | Restraint |
Testing the two
- Germany before 1914 and Japan before 1941 support defensive realism: expansion produced the coalitions that destroyed them.
- The US–China rivalry fits Mearsheimer, who predicted that a rising China would seek dominance in Asia whatever its regime. In 2025, on SIPRI’s figures, China spent about $336 billion on its military, second only to the United States.
- India’s credible minimum deterrence, its preference for partnerships such as the Quad over alliances, and Rajesh Rajagopalan‘s case (2017) for balancing China through closer ties with Washington all follow defensive-realist logic.
Conclusion
Offensive realism explains why great-power rivalry recurs, while defensive realism explains why it is often contained. The first describes great powers within reach of hegemony; the second describes most states most of the time, including India.