Not very. Since we cut and ran, abandoning the South to the communists, the Vietnamese deposed the Chicom's proteges, the Khmer Rouge, from Kampuchea (Cambodia) and fought and won a small border war against the ChiComs themselves. They VN and Red China have territorial disputes over that border and over several islands, most notably the Spratly Islands, where there may be oil.
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Something Communist Vietnamese did to Non-Communist Vietnamese since the Fall of Saigon 30 years ago, exactly:
Pictures of a vietnamese Re-Education Camp
http://Freerepublic.com/focus/f-news/1308949/posts
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