The council had been considering the question of Cambodia and the occupation of the country by Vietnamese troops for almost a decade, however, the council could not act due to lack of agreement amongst its permanent members. Instead, it was addressed by the General Assembly. After the fall of the Khmer Rouge in 1979, Vietnam installed a puppet government, which was opposed by several groups in the country, including the United National Front for an Independent, Neutral, Peaceful and Cooperative Cambodia, Khmer People's Liberation Front and the Party of Democratic Kampuchea, but supported by both Vietnam and the Soviet Union. Representatives from each party gathered for the Paris Conference in 1989, but an agreement was not reached.