The Strategic Arms Limitation Talks (SALT) refers to two rounds of bilateral talks and corresponding international treaties involving the United States and the Soviet Union—the Cold War superpowers—on the issue of armament control. There were two rounds of talks and agreements: SALT I and SALT II. Negotiations commenced in Helsinki, Finland, in 1973. SALT I led to the Anti-Ballistic Missile Treaty and an interim agreement between the two powers. Although SALT II resulted in an agreement in 1979, the United States chose not to ratify the treaty in response to the Soviet invasion of Afghanistan, which took place later that year. The US eventually withdrew from SALT II in 1986.
The treaties then led to START (Strategic Arms Reduction Treaty), which consisted of START I (a 1991 agreement between the United States, the Soviet Union) and START II (a 1993 agreement between the United States and Russia). These placed specific caps on each side's number of nuclear weapons.