Answer: China
Step-by-step explanation:
The Korean War was a conflict between the Democratic People’s Republic of Korea, known as North Korea, and the Republic of Korea, known as South Korea. By June 1950, North Korea, with support from the Soviet Union, invaded the South.
That´s when the war reached international dimensions, as the United Nations and the United States joined the South Koreans side in war, while the People’s Republic of China came to North Korea’s aid.