John Mearsheimer's offensive realism holds that great powers are security maximizers that seek regional hegemony—dominance sufficient to prevent rivals from dominating. War is a rational instrument when opportunities arise to increase relative power. Revisionist powers challenge the status quo; defensive powers seek to maintain it.
Analyze Mearsheimer's explanations of specific conflicts (Crimea, South China Sea, Cold War superpower competition) and evaluate whether offensive realism better predicts behavior than defensive realism or liberalism.
Offensive realism does not predict constant war—rather, it explains when war becomes rational and why deterrence often works (when the costs of victory appear too high). It also does not deny that leaders sometimes make irrational decisions or that domestic politics matters.
Your work on structural realism (Waltz) established the core neorealist argument: the anarchic structure of the international system compels states to be self-reliant in security, producing predictable patterns of balancing behavior regardless of domestic regime type or leadership ideology. Waltz argued that states primarily seek to *survive* — they are security maximizers in the minimal sense. Mearsheimer's offensive realism accepts the structural foundation but disputes the conclusion: he argues that survival under anarchy is best guaranteed not by maintaining the current balance but by maximizing power, ideally to the point of regional hegemony.
The logic begins with five structural assumptions. States are the key actors. No international government exists (anarchy). States can never be certain of other states' intentions. States have offensive military capabilities that can harm others. States are rational actors that prioritize survival. From these premises, Mearsheimer derives a stark conclusion: states have strong incentives to maximize their relative power. In an anarchic world, more power means more security — and since you can never be sure another state won't use its power against you someday, there is no natural stopping point short of dominance. The security dilemma is therefore not a misunderstanding to be corrected through reassurance; it is a structural condition that makes competition a rational default.
The key distinction from defensive realism is the threshold states aim for. Waltz's defensive realism implies states balance to preserve the status quo — they don't want dominance, just security. Mearsheimer argues this misreads the logic: if a state *could* achieve regional hegemony at acceptable cost, it *should*, because dominance eliminates the threat environment. The United States achieved regional hegemony in the Western Hemisphere in the 19th century and has since invested in preventing any other power from doing the same in Europe or East Asia. The Monroe Doctrine, U.S. intervention in both World Wars, and containment of the Soviet Union all fit this logic: America does not want to share the hegemon role. Buck-passing (hoping another state will check the rising power), chain-ganging (getting pulled into alliances beyond your interest), and offshore balancing (maintaining a favorable balance while minimizing costly commitments) are the strategic repertoire that flows from offensive realist premises.
The theory's explanatory power comes from its parsimony: it explains major patterns in great-power behavior — Chinese military buildup, Russian pressure on its periphery, American reaction to both — without needing to know much about domestic politics or individual leaders. Its limitation is the same parsimony: it struggles to explain cooperation, regime change effects, and cases where states deliberately accept power-disadvantageous deals for other reasons. But as a baseline for predicting how great powers will respond to relative power shifts, offensive realism remains one of the most consequential frameworks in contemporary international relations theory.
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