The relaxation of Cold War tensions between the United States and Soviet Union in the early 1970s, associated with Nixon, Kissinger, and Brezhnev. It produced arms control agreements, trade deals, and a framework of ‘peaceful coexistence’ that reduced but did not eliminate the risk of superpower conflict.
Détente — the French word for relaxation — described the shift in American strategy under Nixon and Kissinger from confrontation to managed competition with the Soviet Union. Its practical expression included the Strategic Arms Limitation Talks (SALT I, 1972), which froze the number of ballistic missile launchers on each side; Nixon’s visit to China in 1972, which restructured global power relationships by separating Beijing from Moscow; the Helsinki Accords of 1975, which ratified the post-war European border arrangements in exchange for Soviet commitments to human rights; and substantial expansion of trade, including American grain sales to the Soviet Union. Détente rested on the premise that both superpowers had a shared interest in reducing the risk of nuclear war and that arms control was possible even between ideological adversaries. Its domestic critics from the right — including Ronald Reagan and the emerging neo-conservative movement — argued that it legitimised Soviet power and weakened American resolve; its critics from the left argued that it had no effect on Soviet human rights behaviour and ratified Soviet domination of Eastern Europe. Détente effectively ended with the Soviet invasion of Afghanistan in December 1979, which Carter described as the greatest threat to world peace since the Second World War.
Détente’s enduring significance is as a demonstration that ideological adversaries can manage shared risks without abandoning their competition. The SALT agreements did not end the arms race — both sides continued to develop new weapons systems not covered by the treaty — but they established the principle of mutual verification and the practice of superpower dialogue that survived the subsequent deterioration of relations. Kissinger’s ‘realist’ framework, which subordinated human rights and ideological considerations to balance-of-power calculations, produced practical achievements — avoiding nuclear war being the most important — at a moral cost: the Helsinki Accords that recognised Soviet borders also committed Moscow to human rights norms that Soviet dissidents used as leverage, demonstrating that the moral dimensions of Cold War competition were not as separate from strategic calculation as Kissinger claimed.
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