Upvote:-2
A simple answer is: Soviets had barely the same plan for an all-out nuclear war.
In the 50s, Soviets as well as Americans had a very lazy perception on nuclear weapons: one general wanted to use nuclear bombs over China's border, and tactical nuclear weapons were developed like the Davy Crockett.
In the end, the Mutual Assured Destruction doctrine was shared by both countries and probably both Russian and American citizens were OK with the "don't use nuclear bombs", but it was after USA and USSR had considered the options of a real nuclear conflict.