Conflict: Soviet bloc v NATO, 1945-90 (4,3)

I believe the answer is:

cold war

(Other definitions for cold war that I've seen before include "Hostile period after 1945" , "major stand-off" , "Period of East-West political hostility" , "State of tension and hostility" , "East West tension" .)

I've seen this clue in The Guardian.

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