Rouge killings and to emigration, only about 61,400 Chinese remained in the country. Forced repatriation in 1970 and deaths during the Khmer Rouge era reduced the Vietnamese population in Cambodia from between 250,000 and 300,000 in 1969 to a reported 56,000 in 1984. However most of the victims of the Khmer Rouge regime were not ethnic minorities but ethnic Khmer. Professionals, such as doctors, lawyers and teachers, were also targeted. According to Robert D. Kaplan, "eyeglasses were as deadly as the yellow star" as they were seen as a sign of intellectualism.
Vietnamese occupation and transition
In November 1978, Vietnamese troops invaded Cambodia in response to border raids by the Khmer Rouge. The People's Republic of Kampuchea (PRK), a Pro-Soviet state led by the Kampuchean People's Revolutionary Party, a party created by the Vietnamese in 1951, and led by a group of Khmer Rouge who had fled Cambodia to avoid being purged by Pol Pot and Ta Mok, was established. It was fully beholden to the occupying Vietnamese army and under direction of the Vietnamese ambassador to Phnom Penh. Its arms came from Vietnam and the Soviet Union. In opposition to the newly-created state, a government-in-exile referred to as the Coalition Government of Democratic Kampuchea (CGDK) was formed in 1981 from three factions. This consisted of the Khmer Rouge, a royalist faction led by Sihanouk, and the Khmer People's National Liberation Front. Its credentials were recognized by the United Nations. The Khmer Rouge representative to the UN, Thiounn Prasith, was retained, but he had to work in consultation with representatives of the noncommunist Cambodian parties.
Throughout the 1980s the CGDK, supplied by China, Thailand, the United States and the United Kingdom controlled parts of the country and attacked some of the territory not under their dominance. The refusal of Vietnam to withdraw from Cambodia led to economic sanctions by the U.S. and its allies, made
