Salt-II 1979

SALT-II is a nuclear treaty between the United States and the former Soviet Union that put into place a ceiling of 2,250 delivery vehicles (long range bombers, ICBMs and SLBMs) that the United States and the Soviet Union could each have at any given time. The agreement forced the Soviet Union to destroy 250 existing vehicles in excess of the alloted. The United States however was able to build up its supply, because they only had 2060 at the time of the agreement.
The agreement however had no effect on nuclear warheads, where the United States had a clear advantage, 9,200 to the Soviet Union's 5000.