Let’s get over the delusion that we are going to take Aksai Chin in the near future. It’s not going to happen. Something like that would soon turn nuclear. Only way I see that happening is the breakup of China and Tibet becoming independent. POK and Gilgit Baltistan is a different matter but only if you can be sure that the Pakis won’t go nuclear. Realistically speaking , with two nuclear armed neighbours the most that will happen are short intense border wars. We now have had two Prime Ministers say that the days of redrawing borders is over.Real trigger imo
a) Article 370 done
b) Ram mandir done
c) CAA done and NRC in pipeline
d) Pakistan and opposition party weakened
So China is worried that logically next step is Aksai Chin and PoK.
They pre-empted the action