The major conflict that took place from 1950 to 1953 on the Korean Peninsula was the Korean War. This war started when North Korea, supported by the Soviet Union and China, invaded South Korea on June 25, 1950. The United Nations, mainly led by the United States, intervened to support South Korea. The conflict featured intense battles and a brutal stalemate, ending in an armistice on July 27, 1953. The Korean Peninsula remains divided to this day, with North Korea and South Korea existing as separate entities, representing the broader conflicts of the Cold War era.