2.1 Classical and Neorealism

Realist Principles

Realism is one of the most influential theories in international relations. It paints a blunt picture of global politics: states compete for power and survival in a world with no central authority. Classical realism and neorealism offer different explanations for why this happens, but both agree on the core dynamics.

Classical realists trace conflict back to human nature. Neorealists argue it's the structure of the international system itself that forces states to behave this way. Understanding this distinction is key to the rest of the unit.

Anarchic International System

Anarchy in IR doesn't mean chaos. It means there's no world government sitting above states that can enforce rules, settle disputes, or punish bad behavior. Every state is technically on its own.

• States operate in a self-help system, meaning they must rely on their own capabilities (military, economic, diplomatic) to survive
• This lack of a higher authority creates constant uncertainty: you can never be fully sure what another state intends to do
• International organizations like the UN exist, but they can't force powerful states to comply with rules the way a domestic government can enforce laws on citizens

Because no one is in charge, states default to looking out for themselves. That's the foundation everything else in realism builds on.

State-Centric Approach and Power Dynamics

Realism treats sovereign states as the primary actors in international relations. Non-state actors (corporations, NGOs, international organizations) matter far less in this framework.

• States prioritize national interests and security above all other considerations
• Realists focus on relative gains, not absolute gains. A state doesn't just ask "Am I better off?" but "Am I better off compared to my rivals?" A trade deal that benefits both countries might still concern a realist if the other side gains more.
• Power maximization is a key strategy. States build up military capabilities, economic strength, and diplomatic influence to ensure survival
• A state's overall power comes from a combination of these factors, not just one

Pursuit of National Interests

States focus on achieving and protecting their national interests in an uncertain world. Security concerns tend to dominate foreign policy decisions.

• Economic prosperity and territorial integrity rank among the highest state priorities
• Alliances form based on strategic calculations rather than shared values or ideologies. During the Cold War, the US allied with authoritarian regimes simply because they opposed the Soviet Union.
• Moral considerations take a backseat to pragmatic objectives. Realists argue this isn't cynical; it's just how the system works when survival is at stake.

Balance of Power

Maintaining Equilibrium in the International System

Balance of power theory explains how states work to prevent any single nation from dominating the system. If one state grows too powerful, others will band together or build up their own capabilities to counterbalance it.

• States form alliances or increase military spending to offset potential hegemonic threats (a hegemon is a state with overwhelming dominance)
• When the system is roughly in equilibrium, large-scale wars become less likely because no state feels confident enough to attack
• Historical examples: European powers repeatedly formed coalitions to balance against Napoleonic France in the early 1800s. The Cold War was a decades-long balance between the US and USSR, each leading rival alliance blocs (NATO vs. the Warsaw Pact).

Security Dilemma and Its Implications

The security dilemma is one of realism's most important concepts. It describes a situation where one state's efforts to increase its own security end up making other states feel less secure.

Here's how it works:

1. State A builds up its military to feel safer
2. State B sees State A's military buildup and feels threatened
3. State B increases its own military spending in response
4. State A now feels less secure than before, so it builds up even more
5. The cycle continues, potentially leading to an arms race

The tragic part is that neither state may have intended to threaten the other. Mutual distrust and the inability to know another state's true intentions drive the escalation. Misperceptions about motives can lead to conflicts that nobody actually wanted.

Offensive vs. Defensive Realism

Both offensive and defensive realism are forms of neorealism (structural realism). They agree that the anarchic system shapes state behavior, but they disagree on how much power states should seek.

Both agree power matters. They disagree on how much is enough.

Key Realist Thinkers

Ancient and Modern Foundations of Realism

Thucydides, the ancient Greek historian, is often called the first realist. His account of the Peloponnesian War (431–404 BCE) between Athens and Sparta emphasized how power, fear, and self-interest drove the conflict. His famous line captures the realist worldview: "The strong do what they can and the weak suffer what they must."

Hans Morgenthau developed classical realism in the 20th century. His book Politics Among Nations (1948) argued that the drive for power is rooted in human nature itself. He laid out six principles of political realism, the most famous being that states define their interests in terms of power. For Morgenthau, understanding politics means understanding how power operates, not how we wish it would operate.

Structural Realism and Its Proponents

Kenneth Waltz transformed realist theory with his neorealist (structural) approach. His book Theory of International Politics (1979) shifted the focus away from human nature and toward the anarchic structure of the international system. Waltz argued that the distribution of capabilities among states (how power is spread across the system) determines international outcomes. It doesn't matter whether leaders are good or evil; the system's structure constrains their choices.

John Mearsheimer built on Waltz's framework to develop offensive realism. His book The Tragedy of Great Power Politics (2001) argues that great powers are compelled to seek regional hegemony because the system gives them no choice. For Mearsheimer, the "tragedy" is that even states with peaceful intentions are pushed toward competition by the logic of anarchy.