John Mearsheimer: U.S. Grand Strategy & Hegemonic Decline

Grand strategy is about matching a state’s vital interests with the military means available to defend them. It requires identifying which parts of the world are important enough that a country would be willing to fight and die for, determining the threats to those interests, and deciding what military forces are needed. This differs from foreign policy, which encompasses all a state’s interests and instruments, including diplomacy and sanctions.

For the United States, the vital regions have historically been the Western Hemisphere, Europe, East Asia and the Persian Gulf. The Western Hemisphere is America’s natural sphere of dominance. Europe and East Asia became important because they contained other great powers, while the Persian Gulf mattered because of its oil. The rise of China has changed these priorities: East Asia is now the most important region outside the Western Hemisphere because China has become a peer competitor to the United States.

Four Strategic Choices

There are four broad grand strategies available to Washington: isolationism, offshore balancing, selective engagement and global hegemony.

Isolationism holds that no region outside the United States is important enough to justify fighting and dying. America’s geography, protected by two oceans and nuclear weapons, makes this a potentially viable strategy.

Offshore balancing argues that the United States should intervene when another power threatens to dominate an important region, but otherwise avoid permanent military commitments. After the Soviet Union collapsed, this approach would have favored withdrawing American forces from Europe because no country threatened to dominate the continent.

Selective engagement instead maintains that regions such as Europe remain sufficiently important to justify an American military presence, partly because American forces can act as a stabilizing force.

Global hegemony is the opposite extreme: it treats virtually every region as important and seeks to maintain military capabilities against threats everywhere. The absence of a powerful rival after the Cold War encouraged this strategy, giving Washington fewer incentives to prioritize among its interests.

Russia and the European Security Order

Russia’s position after the Cold War was initially oriented toward integration into a European security structure. The American presence in Europe could even serve Russian interests by providing stability and helping manage the question of reunified Germany.

NATO expansion subsequently transformed the strategic environment. Although Russia was not initially regarded by Washington as a serious threat, continued expansion created a situation that eventually became impossible to manage peacefully.

Russia’s current strategy is therefore heavily shaped by confrontation with the United States and Europe. It has strong incentives to deepen relations with China, Iran and North Korea, while weakening European cohesion and preventing Ukraine from becoming a viable threat to Russian security.

China and the Changing Balance

The conflict involving Iran has temporarily benefited China and Russia by diverting American military resources away from East Asia and Europe. The strain on American forces has weakened conventional deterrence in East Asia.

Yet the United States remains an extraordinarily powerful country. Its underlying capabilities have not been fundamentally reduced. What has suffered is its ability to project power effectively and maintain diplomatic influence and alliances.

The changing balance nevertheless creates serious risks. If American security guarantees become less credible, countries such as Japan could reconsider their military and nuclear options. The broader strategic environment is therefore becoming more dangerous, with rival powers strengthening their relationships while American commitments become increasingly difficult to sustain. The central challenge is to recognize limits, establish priorities and avoid commitments that exceed available means.

(Article that summarises the transcript has been created with the assistance of AI