On May 27, 1972, President of the United States, Richard Nixon, and Soviet President, Leonid Brezhnev, signed the Strategic Arms Limitation Talks (SALT) in the summit.
This marked history for as though these were unlikely candidates to sign an arms limitation treaty. And after previous attempts to come to terms, the two countries finally sat down and came to an agreement.
The SALT talks breakthrough achieved that both countries limit the number of anti-ballistic missiles (ABM), and the number of intercontinental ABMs and submarine-launches ballistic missiles.
This act of detente was to better foreign relations between the US and USSR and achieved it by decreasing Cold War tension and the danger of threats, which was a step closer for the Cold War to end.