Cambodian–Vietnamese War

Cambodian–Vietnamese War
	Part of the Third Indochina War, the Cold War in Asia, and the Sino-Soviet split
	; ; Top: Vietnamese forces entering Phnom Penh in January 1979.; Bottom: Map of the Vietnamese advances in 1979
Date	21 December 1978 – 29 September 1989; (10 years, 9 months, 1 week and 1 day)
Location	Cambodia, Southern Vietnam, Eastern Thailand
Result	1991 Paris Peace Accords; Vietnam's overthrow of Democratic Kampuchea in early 1979; End of the Cambodian genocide; Establishment, then disestablishment, of the People's Republic of Kampuchea; Vietnamese occupation in Cambodia; Chinese invasion of Vietnam and continued border skirmishes; Start of CGDK insurgency and Thai border skirmishes; Establishment of the Coalition Government of Democratic Kampuchea in 1982; Vietnamese withdrawal from Cambodia in 1989; UN-led transition in Cambodia;
Belligerents
Democratic Kampuchea (1977–1982); Thailand (border clashes)	Vietnam; FUNSK (from 1978)
Post-invasion:; Coalition Government of Democratic Kampuchea (1982–1990) Khmer Rouge; KPNLF; FUNCINPEC; Thailand (border clashes)	Post-invasion:; Until April 1989:; Vietnam; People's Republic of Kampuchea; Cuba (reconstruction experts); From April 1989:; State of Cambodia
Commanders and leaders
Pol Pot; Khieu Samphan; Ieng Sary; Son Sann; Dien Del; Norodom Sihanouk;	Lê Duẩn; Trường Chinh; Nguyễn Văn Linh; Võ Nguyên Giáp; Văn Tiến Dũng; Lê Đức Anh; Lê Trọng Tấn; Đoàn Khuê; Võ Chí Công; Heng Samrin; Hun Sen; Pen Sovan; Chea Sim;
Strength
1979: 73,000; 1989: 30,000;	150,000–200,000 Vietnamese soldiers; 1,000 Lao soldiers (1988);
Casualties and losses
1975–1979:; c. 15,000 killed; 1979–1989: more than 100,000 killed;	1975–1979: 10,000 killed; ; 1979–1989: Vietnam: 15,000–25,300 killed; 30,000 wounded; ; People's Republic of Kampuchea: Unknown; ; ; Total: 25,000–52,000 killed;
	200,000+ Cambodian civilians killed; (excluding deaths from famine); 30,000+ Vietnamese civilians killed (1975–1978);

The Cambodian–Vietnamese War was an armed conflict between Democratic Kampuchea, controlled by Pol Pot's Khmer Rouge, and the Socialist Republic of Vietnam. It began in December 1978, with a Vietnamese invasion of Cambodia which toppled the Khmer Rouge and ended in 1989 with the withdrawal of Vietnamese forces from Cambodia.

The war was preceded by years of conflict between Vietnam and the Khmer Rouge, including numerous massacres by the Khmer Rouge, notably the Ba Chúc massacre of over 3,000 Vietnamese civilians in April 1978. On 21 December 1978, the Vietnamese launched a limited offensive towards the town of Kratie. On 23 December 1978, 10 out of 19 divisions of the Khmer Rouge's Kampuchea Revolutionary Army opened fire along the border with Vietnam with the goal of invading the southwestern border provinces of Đồng Tháp, An Giang and Kiên Giang. On 25 December 1978, Vietnam launched a full-scale invasion of Kampuchea, occupying the country in two weeks, capturing the capital Phnom Penh, and removing the Khmer Rouge government of the Communist Party of Kampuchea from power. In doing so, Vietnam put an ultimate stop to the Cambodian genocide which had killed between 1.2 and 2.8 million people or between 13 and 30 percent of the country's population since 1975.

Pol Pot and the Khmer Rouge were forced to retreat into the jungle near the border with Thailand where the Khmer Rouge alongside the Khmer People's National Liberation Front, led by Son Sann, and FUNCINPEC, led by Norodom Sihanouk, continued to fight the Vietnamese army and the pro-Vietnamese Cambodian government. In 1982, they formed the Coalition Government of Democratic Kampuchea. The Vietnamese army withdrew in September 1989, and in 1991 the Paris Peace Agreements were signed, officially ending the war and leading to the restoration of multi-party rule and a constitutional monarchy in Cambodia in 1993.