Realism (classical, neorealism, offensive/defensive)

The realist premise

Realism is the oldest and most durable tradition in International Relations, treating the struggle for power among self-interested states under anarchy as the permanent condition of world politics. Its intellectual lineage is cited from Thucydides' History of the Peloponnesian War (the Melian Dialogue, 416 BCE: "the strong do what they can and the weak suffer what they must"), through Niccolò Machiavelli's The Prince (1532) and Thomas Hobbes's Leviathan (1651, the "state of nature" as a war of all against all). Realism's three load-bearing assumptions are: states are the principal actors; the international system is anarchic (no government above states); and states pursue power and survival as the rational core of the national interest.

Classical realism: human nature

Classical realism locates the drive for power in human nature itself — the animus dominandi, or lust for domination. Its canonical statement is Hans Morgenthau's Politics Among Nations (1948), whose Six Principles of Political Realism insist that politics is governed by objective laws rooted in human nature, that the signpost of realism is "interest defined in terms of power," and that universal moral principles cannot be applied to state action in their abstract formulation. E. H. Carr's The Twenty Years' Crisis, 1919–1939 (1939) is the companion text, attacking inter-war "utopianism" (Wilsonian liberalism) for ignoring the role of power. For classical realists, statecraft is prudence: matching commitments to capabilities, and balancing power against power.

Why the structural turn

Classical realism's reliance on human nature was criticised as unfalsifiable and reductionist. The corrective came from Kenneth Waltz's Theory of International Politics (1979), which relocated the cause of conflict from human nature to the structure of the system. Waltz's earlier Man, the State, and War (1959) had already organised explanations into three images (or levels of analysis): the individual, the state, and the international system. His mature claim is that the third image — anarchy and the distribution of capabilities — best explains recurring patterns such as the balance of power, which Waltz treats as an automatic tendency of the system rather than a deliberate policy. This structural reformulation is neorealism (structural realism), and it dominates the modern syllabus. Candidates must be able to state crisply the move from Politics Among Nations (1948) to Theory of International Politics (1979): from human nature to system structure, from reduction to the unit level to explanation at the systemic level.

Neorealism and the security dilemma

Neorealism holds that because the system is anarchic and states cannot be certain of one another's intentions, each must provide for its own security — self-help. The mechanism that turns uncertainty into conflict is the security dilemma, formalised by Robert Jervis, "Cooperation Under the Security Dilemma" (World Politics, 1978): measures a state takes to make itself more secure (arms, alliances) reduce the security of others, who respond in kind, producing arms races and spirals even among states that seek only safety. Anarchy thus generates competition without requiring any state to be inherently aggressive.

Offensive vs defensive realism

Within neorealism a key fault line — heavily tested — divides defensive from offensive realism.

Defensive realism (Waltz, Jervis, Stephen Van Evera, Charles Glaser) argues states seek an appropriate amount of power, not maximisation; because aggression provokes balancing coalitions and is usually self-defeating, the rational state is a security-maximiser content with the status quo. Excessive expansion is the product of domestic pathology, not system structure.

Offensive realism, set out in John Mearsheimer's The Tragedy of Great Power Politics (2001), argues the opposite: because no state can ever be sure another will not attack, the safest course is to maximise relative power, and the ultimate aim is regional hegemony. States are power-maximisers; great-power competition is tragic and unavoidable. Mearsheimer applies this to the rise of China, predicting intensifying US–China rivalry — a direct line into Indo-Pacific exam questions.

Neoclassical realism

A later refinement, neoclassical realism (Gideon Rose coined the term in a 1998 World Politics review; see Schweller, Zakaria), reinserts unit-level variables — leaders' perceptions, state strength, domestic extraction of resources — as an intervening belt between systemic pressure and actual foreign policy. It explains why states under-react or over-react to the same structural incentives.

Why this matters for the exam

Realism is the analytical default in UPSC GS-2 for explaining great-power behaviour, balance-of-power dynamics in India's neighbourhood, and the limits of international institutions; it also surfaces in the Essay. In the FSOT Job Knowledge section it appears as multiple-choice on IR schools and thinkers. CSS International Relations Paper-I sets direct theory questions — "Compare offensive and defensive realism" or "Realism vs Liberalism applied to a current conflict" — and the framework feeds the compulsory Current Affairs paper. BCS tests it in the International Affairs/General Knowledge segments. High-yield retention: pair each thinker with the exact text and year (Morgenthau 1948; Waltz 1959 and 1979; Jervis 1978; Mearsheimer 2001), and be able to deploy the security dilemma to a named case (e.g., India–Pakistan or US–China). Avoid the common error of conflating classical realism with neorealism — examiners reward the human-nature-versus-structure distinction explicitly.