To China I’d add the illegally occupied and annexed Tibetan territory. It’s old news. But it’s weird to ignore.

Not this century. I was going by this list here for what counts as invasions: https://en.wikipedia.org/wiki/List_of_invasions_in_the_21st_...

and counted 3 or more invasions as prolific invaders.

But your parent is absolutely correct that China and North Korea also regularly engage in wars, though what counts as war and what counts as skirmishes is up for debate, I would count https://en.wikipedia.org/wiki/2020%E2%80%932021_China%E2%80%... as a war (I had just forgotten about it), ditto https://en.wikipedia.org/wiki/2010_Yeonpyeongdo_bombardment

That however just makes my point stronger.