vast majority of Cambodia's historic architecture, 95% of Cambodia's Buddhist temples, was completely destroyed. Vietnamese occupation and transition, 1978–1992 In November 1978, Vietnamese troops invaded Cambodia in response to border raids by the Khmer Rouge and conquered it. 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 the 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 recognised 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. The refusal of Vietnam to withdraw from Cambodia led to economic sanctions by the US and its allies. Peace efforts began in Paris in 1989 under the State of Cambodia, culminating two years later in October 1991 in a Paris Comprehensive Peace Settlement. The UN was given a mandate to enforce a ceasefire and deal with refugees and disarmament known as the United Nations Transitional Authority in Cambodia (UNTAC). Modern Cambodia (1993–present) In 1993, the monarchy was restored with Norodom Sihanouk reinstated as King, and the first post-war election was coordinated by UNTAC. The election was won by FUNCINPEC led by Sihanouk's son Ranariddh in a hung parliament. A power-sharing agreement was agreed with Ranariddh and Hun Sen of the Cambodian People's Party both simultaneously being co-Prime Ministers after the CPP threatened to secede part of the country if power was fully transferred to FUNCINPEC. The stability established following the conflict was shaken in 1997 by a coup d'état led by the co-Prime Minister Hun Sen, who ousted Ranariddh and other parties represented in the government and consolidated power for the CPP. After its government was able to stabilize under Sen, Cambodia was accepted into the Association of Southeast Asian Nations (ASEAN) on 30 April 1999. Norodom