Nixon's ability to get the Soviet Union to agree to a Strategic Arms Limitation Treaty came at an imperative time because of the tensions between these two countries. This era, known as the Cold War, was one of extreme political and military tensions between the US and Soviet Union. At one point in 1962, the US and Soviet Union were mere minutes away from all out nuclear warfare thanks to the Cuban Missile Crisis.
So Nixon being able to deescalate the tensions between these two countries would be considered a positive accomplishment for all of mankind.