Outside of a few boarder disputes with India, I don't China has militarily attacked anyone since they got their ass handed to them by Vietnam (Sino-Vietnamese War 1979). So I think that rules out China.
Looked this up. Happy to learn something. They have confrontations that mostly result in harassing each other with water cannons and dangerous water moves. Massively different than military actions like land invasions, bombings, etc. I'd put it in the bucket as border disputes with India. They are isolated incidences but they are not larger aggressive military actions.