Which post ww2 invasion has China done? Granted, like the USA they've been involved as backers in places like Vietnam - but there's a difference between giving support, and invading?

Let's not forget that the US has a history of things like, training, supporting ho chi Minh - only to end up fighting a war against him. Training, supporting Mujahideen - only to end up fighting a war. Supporting Saddam Hussein, only to fight a war. Training, supporting contras and similar forces in Latin America - and is now fighting a shooting war on drugs in these countries...

[ed: as mentioned in a sibling comment - China intervened with troops in Korea - my apologies - I'm afraid the Vietnam War and later conflicts are more fresh in my mind.

https://history.army.mil/brochures/kw-chinter/chinter.htm ]