Détente (French for "relaxation") denotes the deliberate reduction of superpower hostility that characterised US foreign policy from roughly 1969 to 1979, principally engineered by President Richard Nixon and his National Security Adviser (later Secretary of State) Henry Kissinger. Grounded in Realpolitik rather than ideological reconciliation, détente accepted the Soviet Union as a legitimate, permanent power and sought to manage competition through negotiation, arms control and economic linkage. Its institutional landmarks include the Strategic Arms Limitation Talks producing SALT I (1972), comprising the Anti-Ballistic Missile (ABM) Treaty and the Interim Agreement on offensive arms; the Helsinki Final Act (1975) of the Conference on Security and Co-operation in Europe, which ratified post-war European borders while committing signatories to human-rights "Basket III"; and the Apollo–Soyuz docking of 1975 as symbolic theatre of cooperation.
Triangular diplomacy was the strategic instrument that made détente possible. Exploiting the Sino-Soviet split—the ideological and military rupture between Moscow and Beijing that turned violent at the Ussuri River (Zhenbao/Damansky Island) clashes of March 1969—Kissinger sought to position the United States closer to each communist power than they were to one another, maximising American leverage over both. The opening to China proceeded through Kissinger's secret July 1971 visit via Pakistan ("ping-pong diplomacy" having prepared opinion), culminating in Nixon's February 1972 visit to Beijing and the Shanghai Communiqué, which acknowledged "one China" while normalising contact. Fearing Sino-American collusion, the Soviets accelerated their own summitry, yielding the Moscow Summit of May 1972. Linkage theory tied progress on arms control, trade and grain sales to Soviet restraint in the Third World and assistance in extracting the US from Vietnam.
Détente eroded under accumulating strains. The Jackson–Vanik Amendment (1974) linked most-favoured-nation trade status to Jewish emigration, alienating Moscow; Soviet and Cuban interventions in Angola (1975) and the Horn of Africa, the deployment of SS-20 missiles, and finally the Soviet invasion of Afghanistan in December 1979 destroyed its credibility. President Carter withdrew SALT II (signed June 1979) from Senate ratification, imposed a grain embargo and the 1980 Moscow Olympic boycott. Ronald Reagan's 1981 inauguration inaugurated a renewed "Second Cold War," though the triangular logic endured as Beijing tilted toward Washington.
For the FSOT and US-history components of civil-service examinations, this topic is tested in the diplomatic-history and "American foreign policy since 1945" sections. Candidates should master the distinction between détente (a policy of tension-reduction) and triangular diplomacy (its method of playing China and the USSR against each other), and be able to attach precise dates and instruments—SALT I/II, ABM Treaty, Shanghai Communiqué, Helsinki Final Act, Jackson–Vanik. Typical question angles probe why the Sino-Soviet split was the precondition for the China opening, the role of Realpolitik and linkage in Kissinger's thought, and the specific events (Afghanistan above all) that terminated the era. Comparative questions may contrast Nixonian détente with Reagan-era confrontation and the eventual Gorbachev thaw.
Example
In February 1972 President Richard Nixon travelled to Beijing and signed the Shanghai Communiqué with Zhou Enlai, exploiting the Sino-Soviet split to pressure Moscow into the Moscow Summit and SALT I three months later.
Frequently asked questions
The Sino-Soviet split—militarised by the 1969 Ussuri River clashes—was the precondition for triangular diplomacy. Kissinger exploited the rupture to bring the United States closer to both Beijing and Moscow than they were to each other, maximising American leverage over both communist powers.