(Strategic arms limitation talks) and the ABM treaty 1972 – (anti-ballistic missiles system)- For the first time during the Cold War, the United States and Soviet Union had agreed to limit the number of nuclear missiles in their arsenals.
SALT I is considered the crowning achievement of the Nixon-Kissinger strategy of détente. The ABM Treaty limited strategic missile defenses to 200 interceptors each and allowed each side to construct two missile defense sites, one to protect the national capital, the other to protect one ICBM field.
(For financial and strategic reasons, the United States stopped construction of each by the end of the decade.)