Krushchev knew the USSR couldn't win a nuclear war. In 1961, the USA had 20x more nuclear weapons than the USSR.
Krushchev acted, and without warning on the 13th August 1961, troops began buiding a wall surrounding West Berlin.
At first, it was just a wire fence but by the 17th August it was a stone wall.
All movement between East and West stopped.
The Wall became highly guarded.
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