Just as the title says. What happens if the PRC puts everything into crushing Vietnam in 1979, instead of going at it half-assed as OTL, engaging only border militias and withdrawing after a short time?
The question is how far the PRC dares to push, the Soviets are the closest alllies of the DRVN and have vested interest in rhe country
What does America do here, does it just sit back and let events play out, or does it covertly aid one side or the other?
Including chemical, excluding nuclear, radiological, and biological.What do you mean by everything? Are you including or excluding chemical, biological or nuclear weapons?
IOTL Deng Xiaoping visited Washington and Tokyo and received their political support for a strike on Vietnam, so if Deng decided to escalate it further, the west will covertly support him.
Selling Vietnam a bunch of surplus US arms and economic reconstruction funds in exchange for guaranteeing Vietnam's integrity could seriously repair relations and give them a reason to boot the Soviets.