North Korea–South Korea relations (or alternatively inter-Korean relations) are the diplomatic relationships between the two states of the Korean Peninsula. Formerly a single nation that was annexed by Japan in 1910, the Korean Peninsula has been divided since the end of World War II in 1945. The two countries engaged in the Korean War from 1950 to 1953 which ended in an armistice agreement but without a peace treaty. North Korea is a one-party totalitarian state run by the Kim dynasty. South Korea was formerly governed by a succession of military dictatorships until democratization in 1987 when it held direct elections. Both nations claim the entire Korean peninsula and outlying islands. Both nations joined the United Nations in 1991 and are recognized by most member states. Since the 1970s, both nations have held informal diplomatic dialogues in order to ease military tensions. In 2000, President Kim Dae-jung became the first President of South Korea to visit North Korea, 55 years after the peninsula was divided. In 2018, beginning with North Korea's participation in the 2018 Winter Olympics, the relationship has seen a major diplomatic breakthrough and become significantly warmer. In April 2018, the two countries signed the Panmunjom Declaration for Peace, Prosperity and Unification of the Korean Peninsula. In 2018, a majority of South Koreans approved the new relationship.