Answer:
Russia is the correct answer.
Step-by-step explanation:
The period of tension between the communist countries of Eastern Europe and the capitalist countries of the Eastern Europe that lasted from 1945-1991. It was led by both the countries in their respective zones of influence. During cold war war the globe was divided into two power blocks. US and USSR never declared war on each other but fought proxy wars, competed with each other in space and Arms race.