The freedom to stop fighting is not distributed equally.

In August 2021, the United States withdrew from Afghanistan after twenty years of war. Domestic political exhaustion played a real part in that decision. So did a mission whose objectives had grown murkier with each passing year, a shift in Washington’s strategic attention toward China, and the collapse of the Afghan government itself. Six months later, Russia invaded Ukraine, and Kyiv faced no comparable menu of options. Negotiated settlement, territorial concession, and a frozen conflict were all discussed at various points. None was acceptable if Ukraine wanted to remain a sovereign, self-governing state. The gap between these two cases has little to do with who chose to fight. It has everything to do with what each side retained the freedom to do once the fighting started, particularly the freedom to stop.

That is a more precise version of a familiar but overstated claim: that materially dominant states treat war as a policy instrument while materially weak states experience it as a condition of survival. The claim is broadly right but needs two corrections before it can carry real analytical weight.

The first correction concerns entry. Weak states choose to start wars all the time. Argentina invaded the Falklands in 1982. Iraq invaded Iran in 1980. Serbia entered its wars in the 1990s by choice. Great powers, meanwhile, sometimes have war forced on them, as the United States did after Pearl Harbor. What varies systematically with material power is not the decision to enter a war. It is the range of options a state retains once inside one, and above all its capacity to exit.

The second correction concerns what strategic freedom actually buys a strong state. It does not buy freedom for the duration of an engagement. The United States learned this in Vietnam, in Iraq, and in Afghanistan. France learned it in Algeria. Britain learned it in Northern Ireland. Once a great power commits ground forces to a protracted conflict, occupation dynamics, alliance commitments, and the political cost of an admitted failure narrow its options considerably. Strong states retain more choices before committing to a war and more viable exits once inside one. They do not retain unlimited freedom throughout.

Correcting the claim does not erase the underlying asymmetry. It only locates it properly. James Fearon’s work on........

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