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The Sino-VNese Alliance ended around 1976-77 when the mass ethnic cleansing of ethnic Chinese happenned in Vietnam. Downright hostilities started boiling over when VN and Cambodia went to war, culmulating with the 1st Sino-VN War in 1979 though that war was more of an attempt to remove the Soviet Southern Flank than to avenge Cambodia.
I don't know the strategic reasons for the 2nd Sino-VN War in 84-87 which ended in a pissing contest more than anything else.
I do not recall any US mission that far north into China which would have met by Chinese air defence rather than Vietnamese.
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Chimo
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