[Aceroassert]

The China-Vietnam War was actually a joke. Vietnam couldn't have beaten off US without China support and supply (but to be fair, from USSR too). The whole affair got blown over to Cambodia and Vietnam got too ambitious and started talking tough with China after a historically glorious victory over US. The China-Vietnam border tensed up and by that time, USSR didn't gave a damn if these two historic brothers wanted to fight among themselves or kill themselves since China had turned face with USSR. Then Vietnam talked louder and China invaded, all the way to the gates of Hanoi within two weeks, something US couldn't do in ten years. Vietnam sued for peace, China accepted and retreated. Basically, the terms were something like brothers among brothers, some quarrels, let's forget it. Today, one from either side can still cross China-Vietnam checkpoints without visas, even without passports. Those seeking visas and passports stamping are runroad foreigners on visa runs.