What: the war was fought between North Korea, the Soviet Union, and the peoples republic of china against South Korea, United States, and the United Nations
who: the leader for north korea was kim ll-sung.the president of south Korea is Syngman Rhee and Chung ll-kwon.
When : June 25 1950 to July 27 1953
Where : the war was fought on the Korean Peninsula, Sea of Japan, and the Korea Strait.
Why: The war started by North Korea invading South Korea.
How: when North Korea invaded South Korea, South Koreans army fled and the United Nations came to help out.