On January 7, 1979 Vietnamese forces captured Phnom Penh and toppled the Khmer Rouge regime of Pol Pot, ending the Democratic Kampuchea government responsible for the Cambodian genocide and installing a pro-Vietnamese government, after which Pol Pot and his forces fled to the western jungles to wage a long guerrilla war. Relations between Democratic Kampuchea and Vietnam had collapsed into border war, and on December 25, 1978 Vietnam launched a full invasion with roughly 150,000 troops alongside the Kampuchean United Front for National Salvation, a body of Khmer defectors led by Heng Samrin. The Khmer Rouge army was routed within two weeks.
On January 7, 1979 the Vietnamese army entered Phnom Penh, which the Khmer Rouge had largely emptied of people; Pol Pot and the Democratic Kampuchea leadership fled westward toward the Thai border. On the following day a pro-Vietnamese state, the People's Republic of Kampuchea under Heng Samrin, was proclaimed. The Vietnamese occupation lasted until 1989.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: Pol Pot and the Khmer Rouge government of Democratic Kampuchea, overthrown on January 7, 1979 when Vietnam took Phnom Penh; the leadership fled to the western jungles.
RESEARCHED NAME
Key figures
Pol Pot (Khmer Rouge leader who fled)
Heng Samrin (Khmer defector installed as head of the new state)
The Vietnamese army (which captured Phnom Penh)
Sources
On 7 January 1979 the Vietnamese army entered Phnom Penh along with members of the Kampuchean United Front for National Salvation, and on the following day a pro-Vietnamese Kampuchean state, the People's Republic of Kampuchea, was established with Heng Samrin as Chief of State, after Vietnam's 25 December 1978 invasion with 150,000 troops overran the Kampuchean Revolutionary Army in two weeks.
The Vietnamese invasion ended Pol Pot's government, which had been responsible for the deaths of almost a quarter of all Cambodians between 1975 and December 1978 during the Cambodian genocide, and Vietnamese military intervention and the subsequent facilitation of international food aid to mitigate the famine ended the genocide.
On January 7, 1979 the Vietnamese Army captured Phnom Penh in a blitzkrieg campaign and overthrew the Khmer Rouge regime, and Pol Pot and his staff, together with the bulk of the Khmer Rouge Army, made a strategic withdrawal to the jungle mountains of western Cambodia near the Thai border, where they set up a resistance government.
SOURCE REVIEWEDWars of the 20th Century, Cambodian-Vietnamese Waropen source ↗
In 1978 Vietnamese troops invaded Cambodia, capturing Phnom Penh in early 1979, a moderate Communist government was established, and Pol Pot and the Khmer Rouge retreated back into the jungle, from where the Khmer Rouge continued guerrilla actions against the Phnom Penh government.
SOURCE REVIEWEDHistory.com, Pol Pot overthrownopen source ↗
Editorial Note
Arc closer: this January 7, 1979 fall of Phnom Penh CLOSES the long Cambodia thread that this enrichment has followed from Sihanouk's 1970 overthrow through Lon Nol's 1975 flight and the Khmer Rouge's own capture of the capital; it ends the Democratic Kampuchea regime of Pol Pot. Fate coding: Pol Pot and the Khmer Rouge leadership fled to the western jungles near Thailand, matching the dataset's fled-the-country fate; they were not captured and continued a guerrilla insurgency for years. Coding note: the dataset labels this a foreign-backed coup, accurately, as it was a Vietnamese military invasion that installed a client government (the People's Republic of Kampuchea under Heng Samrin). Genocide context handled neutrally: the Khmer Rouge genocide of 1975 to 1979, with death-toll estimates commonly given as around 1.7 to 2 million or roughly a quarter of the population, is recorded as the documented backdrop; the intervention ended it while beginning a ten-year Vietnamese occupation resented by many Cambodians, a contested characterization recorded from the sources. Pol Pot died under Khmer Rouge house arrest in 1998, later context.
Cross-Reference
Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: Pol Pot and the Khmer Rouge government of Democratic Kampuchea, overthrown on January 7, 1979 when Vietnam took Phnom Penh; the leadership fled to the western jungles..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; fled the country. The baseline file does not name individual targets; researched names are kept in a separate layer.
Baseline Dataset Citation
Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
“Hanoi Reports Cambodian Capital Conquered by ‘Insurgent’ Forces...” January 8, 1979
“Liberation Group Says it Has Formed Regime in Cambodia,” by Henry Kamm, January 9, 1979
“Third World and West Join to Assail Vietnam in U.N. Defeat for Vietnamese Nothing Good Said About Regime Cuba Involved in Sharpest Debate,” by Malcolm W. Browne, January 14, 1979
“Years of Torment, Steps Towards Peace,” October 24, 1991
Chicago Tribune
“Regime Easily Wins Vote in Cambodia,” May 4, 1981
This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →