How did political divisions during the cold war affect the korean war, the cuban missile crisis, and the vietnam war

First of all it is very important to define the events here.

1) Korean War was a conflict which began when some 75.000 soldiers from the North of Korea People's Army Poured the 38th parallel the boundary between the Soviet-backed the Democratic  people's Republic of Korea to the north and the north western republic of Korea to the South.

2) Cuban Missile Crisis was a direct and dangerous confrontation between the U.S. and the Union Sovietica  during cold war.( 1962).

3) Vietnam War:  Was a long, costly conflict between communist north of Vietnam and the Viet Cong again south vietnam and the United States.

The politics divisions produced that these conflicts took more time.