The Cambodian–Vietnamese War was an armed conflict between the Socialist Republic of Vietnam and Democratic Kampuchea. The war began with isolated clashes along the land and maritime boundaries of Vietnam and Kampuchea between 1975 and 1977, occasionally involving division-sized military formations. On 25 December 1978, Vietnam launched a full-scale invasion of Kampuchea and subsequently occupied the country after the Khmer Rouge was removed from power. During the Vietnam War, Vietnamese and Khmer Rouge communists had formed an alliance to fight U.S.-backed regimes in their respective... countries. Despite their open display of cooperation with the Vietnamese, the Khmer Rouge leadership feared that the Vietnamese communists were scheming to form an Indochinese federation with Vietnam as the dominant force in the region. In order to preempt an attempt by the Vietnamese to dominate them, the Khmer Rouge leadership began purging Vietnamese-trained personnel within their own ranks as the Lon Nol regime capitulated in 1975.
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| Occurred: |
May 1975 - December 1989
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| Location: | Cambodia |