Appeasement is hardly the word one would use to describe the tension that existed between the U.S. and U.S.S.R. during the time period stated; rather there was mutual fear of a nuclear holocaust which caused one side or the other to give way. The situation was perhaps best illustrated by Albert Einstein, when he was asked about World War III. His reply:
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
A classic example is the Berlin Air Lift. The Soviets were determined to starve out the city so that it would fall completely under Soviet domination. The Soviets could easily have shot down American planes flying into Berlin, but did not do so for fear of retaliation by the U.S. Similarly, during the Korean Conflict, Russian pilots wearing Chinese uniforms and speaking Chinese on the radio often participated in the war effort. Again, they concealed their identity for fear of the results, which would conceivably have been mutually assured destruction.