Time during which the relationships between east and west were very bad

The Cold War

Explanation:

The Cold War was a time of tension between the Soviet Union (East) and United States of America (West). While neither nations wanted to be the one to declare war, they spied on each other and their secrets. There was a lot of tension because both nations has great nuclear missiles, and one missile launched could cause a whole new war and global catastrophe full of nuclear warfare.

Therefore, the answer is The Cold War.

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