Red brotherhood at war: Indochina since the fall of Saigon

"...the most comprehensive account of events since 1975 in Indochina - explains why communist victory did not usher in a period of peace based on proletarian internationalism. While victorious revolutionaries in Vietnam and Laos strengthened their special relationship, Vietnam's relations with fraternal Cambodia and China deteriorated into full-scale war. The Vietnamese overthrow of Pol Pot's regime in 1979 was condemned by the West, which joined with China to support the Khmer Rouge-dominated anti-Vietnamese resistance in Cambodia. An inter-communist war thus became one of the focal points of the New Cold War in the 1980s."