How were NATO and the Warsaw Pact a cause of the Korean War?

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The North Atlantic Treaty Organization was formed in 1949, a military alliance of twelve Western countries, since increased to twenty-nine. In 1955, the Soviet Union and seven other Eastern Bloc countries joined together to form the Warsaw Pact.

Between these two events, in 1950, North Korea invaded South Korea, starting...

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The North Atlantic Treaty Organization was formed in 1949, a military alliance of twelve Western countries, since increased to twenty-nine. In 1955, the Soviet Union and seven other Eastern Bloc countries joined together to form the Warsaw Pact.

Between these two events, in 1950, North Korea invaded South Korea, starting the Korean War. Depending on your historical perspective, the Korean War either ended in 1953 with the Korean Armistice Agreement or is still going on without active combat, since neither side has won. If you take the former view, one cannot say that the Warsaw Pact had any effect on the Korean War, since it was only signed two years after the war ended. However, it is clearly true that the future Warsaw Pact countries, most significantly the Soviet Union, supported North Korea in the war, just as NATO countries, most importantly the United States of America, supported South Korea. Without Soviet backing, it is very unlikely that North Korea would have invaded, and if the South had not been supported by the United States, the North would have won very quickly.

The Korean War was the first major proxy war fought as part of the Cold War. Both NATO and the Warsaw Pact created huge military alliances, each too powerful to be attacked directly. The battle was therefore conducted by proxy in Korea and then in Vietnam, leading to huge loss of life but not to another World War.

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