Khmer Republic - Coup

Coup

For more details on this topic, see Cambodian coup of 1970.

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.

Despite these actions, which directly contradicted Sihanouk's policy of partial tolerance of North Vietnamese activity, it appears that Lon Nol himself had great personal reluctance to depose the Head of State: he initially may merely have wanted Sihanouk to apply more pressure to the North Vietnamese. He initially refused to commit to the plan; to convince him, Sirik Matak – who appears to have had a coup in mind from the start – played him a tape-recorded press conference from Paris, in which Sihanouk threatened to execute them both on his return to Phnom Penh. However, the Prime Minister remained uncertain, with the result that Sirik Matak, accompanied by three army officers, compelled a weeping Lon Nol to sign the necessary documents at gunpoint.

A vote was taken in the National Assembly on 18 March under the direction of In Tam, in which Sihanouk was stripped of his power: Lon Nol assumed the powers of the Head of State on an emergency basis. On 28 and 29 March there were large-scale popular demonstrations in favour of Sihanouk in several provincial cities, but Lon Nol's forces suppressed them with great brutality, causing several hundred deaths. A number of government officials were murdered by demonstrators, including Lon Nol's brother Lon Nil.

Foreign regimes were initially uncertain as to the level of support to give to the new government. The North Vietnamese continued to hold talks with Lon Nol regarding the reinstatement of the cancelled trade agreement, though subsequent events meant that these were soon to come to an end.