The United States and the United Nations responded to the invasion by sending troops and supplies to South Korea. The United States also launched a naval blockade of North Korea. The fighting between North and South Korea was fierce, and the war soon settled into a stalemate. The war ended on July 27, 1953, with the signing of an armistice agreement. The armistice agreement established a demilitarized zone (DMZ) between North and South Korea, which has remained in place to this day.
The Korean War was a major conflict of the Cold War. The war was a proxy war between the United States and the Soviet Union, who supported North Korea and South Korea, respectively. The Korean War also had a significant impact on the Korean Peninsula, which remains divided to this day.