 Afterwards, the shooting war was ended with the Korean Armistice Agreement (27 July 1953); and the superpower Cold War in Asia then resumed as the Korean Demilitarized Zone.Consequent to the Sino-Soviet split, the pragmatic China established politics of détente with the United States in an effort to publicly challenge the Soviet Union for leadership of the international Marxist–Leninist movement.Mao Zedong's pragmatism permitted geopolitical rapprochement and facilitated President Richard Nixon's 1972 visit to China which subsequently ended the policy of the existence to Two Chinas when the United States sponsored the People's Republic of China to replace the Republic of China (Taiwan) as the representative of the Chinese people at the United Nations.