why did the soviets and chinese split in 1960
Sino-Soviet split The Sino-Soviet split (1960–89) was the deterioration of political and ideological relations between the neighboring states of the People's Republic of China (PRC) and the Union of Soviet Socialist Republics (USSR) during the Cold War. In the 1960s, China and the Soviet Union were the two largest communist states in the world. The doctrinal divergence derived from Chinese and Soviet national interests, and from the governments' different interpretations of Marxism–Leninism.
Korean conflict The Korean conflict is based on the division between the Democratic People's Republic of Korea in the north and the Republic of Korea in the south, both of which claim to be the government of the whole country. During the Cold War, North Korea was backed by the Soviet Union, China, and other communist states, and South Korea was backed by the United States and its allies. The division of Korea occurred at the end of World War II in 1945, and tensions erupted into the Korean War in 1950. When the war ended, the country was devastated, but the division remained. North and South Korea continued a military standoff with periodic clashes. The cold civil war survived the collapse of the Eastern Bloc of 1989 to 1991.