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.