Which event did the soviet union fear during the cold war? - other communist nations would conquer the soviet union. - capitalist nations would come together and lead world war ii. - capitalist nations would eventually destroy the soviet union. - other communist nations would emerge to be more prosperous.

The best answer is, Capitalist nations would eventually destroy the Soviet Union. 

During the Cold War, the United States and the Soviet Union both saw each other as rivals and adversaries in every sphere of government and culture leading to decades of indirect conflict within the international system. One of the greatest fears of the Soviet Union was the influence of democracy and capitalism associated with the United States on the satellite states surrounding Russia. Leaders of the Soviet Union saw these influences as potentially damaging to the communist state and limited such exposure, effectively cutting off the Western world from Soviet territories. 

What he said