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The invasion was about border dispute between the Kampucheans and Vietnamese government. As Pol Pot wanted his nation to become "year zero" a utopia and agrarian society. As vision of following his theory of "year zero" he wanted the "lost" land which belongs to Khmer Empire long ago but the Vietnamese took it. As the Kampucheans negotiate with Vietnam about give their "land" back, the Vietnamese immediately rejected their claim. Pol Pot assign a invasion to Vietnam island, Phú Quốc. The Khmer Revolutionary army captured Phú Quốc, but the Vietnam People's Army quickly re-captured it again. Massacre was against the Vietnamese people who were living in Phú Quốc. As a return the VPA invaded Democratic Kampuchea with 120,000 troops and captured Phnom Penh in 17 days two years later from the Khmer Rouge invasion of Phú Quốc. They setup a pro-Vietnamese government in People's Republic of Kampuchea with a puppet. As a revenge, the Khmer Rouge seek for the Chinese for action, Eventually the Chinese attempt to invade Vietnam. PRC was defeated. There was 2 reason why they lost.

1. They did not reach to Hanoi

2. They did not get the Vietnamese out of Cambodia.

And there you have it -

Vietnam invaded Cambodia because Khmer Rouge massacre in Phú Quốc. (South of Cambodia)

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13y ago

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