The major conflict that occurred between 1950 and 1953 on the Korean Peninsula is known as the Korean War. It began when North Korea, backed by the Soviet Union and China, invaded South Korea on June 25, 1950, aiming to unify the peninsula under communist rule. The United Nations, predominantly led by the United States, intervened to support South Korea. The war saw significant battles, shifts in territory, and a harsh stalemate along the 38th parallel. It ultimately ended with an armistice on July 27, 1953, but no formal peace treaty was signed, resulting in a continued division between North and South Korea.