Theories of International Relations

International relations theories are competing analytical lenses for explaining state behaviour, war, cooperation, and global order. No single theory fully explains world politics; the discipline's vitality lies in their disagreement.

Major theoretical traditions

Realism

The dominant theoretical tradition of 20th-century IR. Core assumptions:

1. States are the principal actors.
2. The international system is anarchic (no central authority).
3. States are unitary, rational actors.
4. States pursue power and security.
5. Conflict is endemic; cooperation is fragile.

Classical realism

• Thucydides — History of the Peloponnesian War; "the strong do what they can and the weak suffer what they must" (Melian Dialogue).
• Machiavelli — politics as it is, not as it ought to be.
• Hobbes — state of nature analogy.
• Hans Morgenthau — Politics Among Nations (1948); six principles of political realism; statecraft as the prudent pursuit of national interest defined as power.

Neorealism (structural realism)

• Kenneth Waltz — Theory of International Politics (1979). System structure (anarchy + distribution of capabilities) shapes state behaviour. Defensive realism — states seek enough power for security.
• John Mearsheimer — The Tragedy of Great Power Politics (2001). Offensive realism — states maximise power, aim for regional hegemony.

Neoclassical realism

Combines systemic pressures with domestic political variables (Rose, Schweller).

Liberalism

Roots in Enlightenment thought (Kant, Locke, Smith, Wilson). Core claims:

1. Multiple actors matter — states, IGOs, NGOs, MNCs, individuals.
2. Cooperation is possible and often rational.
3. Institutions, trade, democracy and norms can transform world politics.

Strands

• Liberal internationalism (Wilson) — collective security, self-determination.
• Republican liberalism (Democratic Peace Theory) — democracies rarely fight each other.
• Commercial liberalism — economic interdependence reduces conflict.
• Institutional liberalism / Neoliberalism (Keohane, Nye) — international institutions reduce transaction costs, allow cooperation under anarchy (After Hegemony, 1984).
• Sociological liberalism — transnational ties create shared identities.
• Complex interdependence (Keohane & Nye, 1977) — multiple channels, no hierarchy of issues, military force less central.

Constructivism

Emerged in the 1990s, challenging materialist assumptions. Core claims:

• The international system is socially constructed.
• Norms, identities and ideas constitute interests.
• Structure and agents are mutually constitutive.
• "Anarchy is what states make of it" (Wendt, 1992).

Key thinkers

• Alexander Wendt — Social Theory of International Politics (1999).
• Martha Finnemore — norms entrepreneurs; National Interests in International Society.
• Peter Katzenstein — culture and national security.
• Kathryn Sikkink — norm life cycles.

Marxism and World-System theory

Roots in critique of capitalism. Core claims:

• World politics is driven by class struggle and capitalist accumulation.
• The state serves dominant class interests.
• Imperialism is integral to capitalism (Lenin, Imperialism: The Highest Stage of Capitalism, 1916).

Variants

• Dependency theory (Frank, Cardoso) — peripheral underdevelopment caused by core domination.
• World-System theory (Wallerstein) — core, semi-periphery, periphery in a single capitalist world-economy.
• Neo-Gramscian (Robert Cox, Stephen Gill) — hegemony works through ideas, institutions and material capabilities; "theory is always for someone and for some purpose."

English School (international society)

Originated at LSE in the 1950s-60s. Core idea: states form an international society with shared institutions (sovereignty, diplomacy, international law, balance of power, war regulation, great-power management).

Key thinkers

• Hedley Bull — The Anarchical Society (1977).
• Martin Wight — three traditions (Realist, Rationalist, Revolutionist).
• Adam Watson, Barry Buzan — extending the school globally.

Pluralist vs. solidarist debate within the school: how robust can shared values be?

Feminist IR

Emerged in the 1980s, gained prominence in the 1990s.

Strands

• Liberal feminism — equal opportunity for women in diplomacy and politics.
• Standpoint feminism — knowledge produced from women's experiences.
• Post-structural feminism — gender as discourse.
• Post-colonial feminism — intersection of gender, race, class.

Key thinkers

• J. Ann Tickner — Gender in International Relations (1992).
• Cynthia Enloe — Bananas, Beaches and Bases (1989).
• Christine Sylvester, Spike Peterson, Laura Sjoberg, Cynthia Weber.

Critical theories

Inspired by the Frankfurt School. Aim to expose power structures and emancipate the marginalised.

• Robert Cox — distinction between problem-solving theory (takes the world as given) and critical theory (questions structures).
• Andrew Linklater — Habermasian discourse ethics applied to IR.
• Ken Booth — Theory of World Security — emancipation as the goal.

Post-structuralism

• Richard Ashley, James Der Derian, R.B.J. Walker — questioning the inside-outside distinction.
• Discourse, representation, deconstruction — how language and texts constitute international relations.

Post-colonialism

Edward Said's Orientalism (1978) inaugurated post-colonial IR. Mahmood Mamdani, Robert Vitalis, Sanjay Seth, Pinar Bilgin. Examines how colonial legacies shape the international order and IR theory itself.

Green Theory / Ecological IR

The natural environment and ecological limits as constitutive of world politics. Anthropocene as a paradigm shift.

Levels of analysis (Kenneth Waltz, Man, the State and War, 1959)

1. First image — individual leaders and human nature.
2. Second image — domestic political and economic structures.
3. Third image — international system / structure.

Most theories operate at one or more levels. Realism privileges the third; liberalism often the second; constructivism cuts across.

Foreign-policy analysis (FPA)

Bridges IR and comparative politics:

• Rational actor model — states as unitary, value-maximising.
• Bureaucratic politics model (Allison) — Essence of Decision (1971).
• Organisational behaviour model.
• Cognitive and psychological approaches — operational code, prospect theory, groupthink.
• Two-level games (Putnam) — leaders negotiate simultaneously at domestic and international levels.

Inter-paradigm debates

The discipline has been shaped by "great debates":

1. First debate: Idealism (interwar) vs. Realism (post-WWII).
2. Second debate: Behaviouralism vs. Traditionalism (1960s).
3. Third debate: Neorealism vs. Neoliberalism (1980s).
4. Fourth debate (or third great debate): Rationalism vs. Reflectivism (1990s).

Theoretical applications

South Asia

• Realism explains India-Pakistan deterrence, arms races, balance-of-power calculations vis-à-vis China.
• Liberalism illuminates SAARC, trade prospects, Indus Waters Treaty's institutional design.
• Constructivism highlights how Kashmir is constructed differently in Indian and Pakistani national identity.
• Post-colonialism unpacks the colonial legacy of partition.

CPEC

• Realism views CPEC through China's strategic competition with the US/India.
• Liberalism emphasises trade integration and Belt-and-Road institutional architecture.
• Marxist lens questions dependency, debt, and corporate beneficiaries.

Contemporary theoretical trends

• AI and IR — algorithms in warfare and diplomacy.
• Climate IR — beyond green theory, integrating climate into mainstream paradigms.
• Decolonising IR — questioning the Western canon, recovering non-Western voices (e.g., Iqbal's pan-Islamism, Indian thinkers like Subaltern Studies, African writers like Mazrui).
• Quantum IR — emerging metaphors from quantum physics.

The richness of IR theory lies in its plurality. A CSS officer who can wield multiple theories nimbly engages global affairs with intellectual rigour rather than ideological dogma.