2002 年 2002 巻 130 号 p. 128-142,L13
In 1965, when U. S. military forces intervene in South Vietnam directly, Vietnam Worker's Party (VWP) started a large military build up in South Vietnam. The combination of northern personnel and Chinese military equipments via Cambodia, and Cambodian rice became indispensable for VWP's war in the south. Using this combination, VWP initiated “general offensive and general uprising” in 1968 and failed. Chinese supplies and Cambodian rice continued to be vital to the VWP.
U. S. military leadership recognized VWP's supply pattern and with Cambodian anti-Sihanouk group, they organized anti-VWP riots in 1970. Sihanouk reacted violently and Cambodian government leaders decided on a coup d'etat.
As an aftermath of the coup, an unstable Sihanouk-Cambodian Communist Party (CCP) Alignment was formed by China and VWP, but CCP leader-ship led by Pol Pot directed independent external policy, while utilized China and VWP aid and assistance.
U. S. -Chinese detente and Vietnam peace accords did not include Cambodian peace because of CCP's intransigency and U. S. minunderstanding of the CCP's independency. The Cambodian army of Lon Nol confused after massive expansion and unable to defend the main roads and countryside, was defeated by the CCP's forces in 1975.