So China backed both North Vietnam and Cambodia, but reunified Vietnam invaded Cambodia and then China and Vietnam have a border war. Weren’t they all communist brethren? Can someone help explain Sino-Viet-Cambodian relations between 1970-1989? | AskHistorians Archive Observer

So China backed both North Vietnam and Cambodia, but reunified Vietnam invaded Cambodia and then China and Vietnam have a border war. Weren’t they all communist brethren? Can someone help explain Sino-Viet-Cambodian relations between 1970-1989?

by J2quared

hellcatfighter

More can (and should) be said, but I have an earlier answer on Sino-Vietnamese relations pre-1979 here.