In 1979 while Vietnamese soldiers invaded and controled over Cambodia, UN declared for not to officially recognize Cambodian regime as saying that this regime was the pro Vietnamese puppit government and especially many of other countries condemned this aggression and toward of as well as economic sanction. There were more than 24 divisions of Vietnamese troop occupying in Cambodia until 1989. In the mid of 1980, Government forcefully stopped the people who were feeling freedom of singing an old song (Popular songs between 1970-1975 during Lon Nol regime)or express any changing idea. Rural people began to live in group for producing rice, fish, and other agricultural products for food but all of them could have their own possesion. People were not allowed to talk in blame to government and listen only to radio of the state. In 1985, More and more opponents to this government were arrested and jailed.

The continuing of running-away of people to the border was increasingly. The fighting against VN and Pro VN government troops, of The three resistant groups (Khmer rouge, Son San and Sihanoukist)were seen to be in a serious war since 1981, when the UN members voted to distinguish Resistant group as a country representative member to United Nation. Then, Puppet government condemned the announcement. In 1982, one of largest camps of Son San factor (Nang Chan) was fired and destroyed by Vietnamese troop and its alliance, thousand of refugees moving across the border into Thailand after a long negotiation between Thai government and UN. At the result, there were many refugees killed in the scene including civilian and resistant soldiers (Maybe UN had this in a real report)and as well as children. In 1984, two other big camps of Son San factor were also fired and occupied by VN and its alliance troop. There were many many thousands of refugees running across the border into Thailand and as well as many wounded and so many people killed, UN could know that.

Peace efforts intensified in 1989 and 1991 with two international conferences in Paris, and a UN peacekeeping mission helped maintain a cease-fire.The beginning of repatriation in late 1992 of more several handred thousands of Khmer people from Khmer-Thai border (In Thai side) under support from UNHCR and strongly cooperative from UNBRO upon Paris accord of 1991. There were approximately 40% of repatriated people from the border offered land for their shelters to which the province they were to go.

UN-sponsored elections in 1993 helped restore some semblance of normalcy as did the rapid diminishment of the Khmer Rouge in the mid-1990s. Norodom Sihanouk was reinstated as King. A coalition government, formed after national elections in 1998, brought renewed political stability and the surrender of remaining Khmer Rouge forces in 1998. Compared to its recent past, the 1993-2003 period has been one of relative stability for Cambodia. However, political violence continues to be a problem.