Khmer Republic

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The Khmer Republic (French: République Khmère) was the republican government of Cambodia that was formally declared on October 9, 1970. It was replaced in 1975 by the totalitarian state known as Democratic Kampuchea. Formally declared on October 9, 1970, the Khmer Republic was a right-wing pro-United States military-led government headed by General Lon Nol and Prince Sisowath Sirik Matak that took power in the March 18, 1970 coup against Prince Norodom Sihanouk, then the country's head of state. The main causes of the coup were Norodom Sihanouk's toleration of North Vietnamese activity within Cambodia's borders, allowing heavily armed Vietnamese Communist outfits de facto control over vast areas of eastern Cambodia. Another important factor was the dire state of the Cambodian economy, an indirect result of Sihanouk's policies of pursuing neutrality through virulent anti-Americanism. With the removal of Sihanouk, the existing Kingdom of Cambodia became a republic, although the throne had been officially vacant for some years since the death of King Norodom Suramarit. The character of the new regime was right-wing and nationalist; most significantly, it ended Sihanouk's period of covert cooperation with the North Vietnamese regime and the Viet Cong, and aligned Cambodia with South Vietnam in the ongoing Second Indochina War. 

The Khmer Republic was opposed within the Cambodian borders by the Front Uni National du Kampuchea or FUNK, a relatively broad alliance between Sihanouk, his supporters, and the Communist Party of Kampuchea. The insurgency itself was conducted by the CPNLAF, the Cambodian People's National Liberation Armed Forces: they were backed by both the People's Army of Vietnam (PAVN) and the National Liberation Front (NLF, better known as the Viet Cong), who occupied parts of Cambodia as part of their ongoing war with the South Vietnamese government. Despite the strongly militaristic character of the Khmer Republic, and quantities of military and financial aid from the United States, its army (the Force Armée Nationale Khmère, or FANK) was poorly trained and unable to defeat either the CPNLAF or the Vietnamese forces of the PAVN and NLF. The Republic eventually fell on 17 April 1975, when the Cambodian communists took Phnom Penh.

Sihanouk himself claimed that the coup was the result of an alliance between his longstanding enemy, the exiled right-wing nationalist Son Ngoc Thanh, the politician Prince Sisowath Sirik Matak (depicted by Sihanouk as a disgruntled rival claimant to the Cambodian throne) and the CIA, who wished to install a more US-friendly regime. There is in fact little if any evidence of CIA involvement in the coup, although it seems that sections of the US military establishment – notably the Army Special Forces – may have had some involvement in terms of offering support and training to the plotters after being approached by Lon Nol.  

While Sihanouk was out of the country on a trip to France, anti-Vietnamese rioting took place in Phnom Penh, during which the North Vietnamese and NLF embassies were sacked. It seems likely that this rioting was at least tolerated, and possibly actively organised, by Lon Nol, the Prime Minister, and his deputy Prince Sirik Matak. On 12 March, the prime minister closed the port of Sihanoukville – through which weapons were being smuggled to the NLF – to the North Vietnamese and issued an impossible ultimatum to them. All PAVN/NLF forces were to withdraw from Cambodian soil within 72 hours (on 15 March) or face military action.
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