At the February 1945 Yalta Conference, Stalin was allowed to keep the eastern part of Poland in exchange for respecting the independence of EasternEuropeancountries
During the 1948 Berlin Blockade, the Soviets cut off supplies to West Berlin, leading to the subsequent Berlin Airlift by the Americans to keep the city free
During the Cuban Missile Crisis in October 1962, the world was on the verge of WWIII, but a peaceful conclusion was negotiated by Kennedy and Khrushchev