The United States (U.S.) voted for the Khmer Rouge and the Khmer Rouge-dominated Coalition Government of Democratic Kampuchea (CGDK) to retain Cambodia's United Nations (UN) seat until as late as 1993, long after the Khmer Rouge had been mostly deposed by Vietnam during the 1979 Vietnamese invasion of Cambodia and ruled just a small part of the country. It has also been reported that the U.S. encouraged the government of China to provide military support for the Khmer Rouge. However, related allegations from several sources, notably Michael Haas, that the U.S. directly armed the Khmer Rouge in order to weaken the influence of Vietnam and the Soviet Union in Southeast Asia have been disputed by the U.S. government and Nate Thayer, who argued that little, if any, American aid actually reached the Khmer Rouge.