China is probably not yet ready to mount a complex air-sea invasion of Taiwan, with the mighty USA at its back. But it would have no real difficulties making land invasion into Russia.
Taiwan.. not yet, too hard, but Russia is officially a GO opines our dunk tank subject, further free military advice for China can be found in the article
What are the odds this Telegraph idiot thinks the liberation of Tibet was a Chinese invasion?
300% at least. Also the first invasion i mentioned, Taiwan at the end of civil war, was only an invasion from stricte military point of view as in "naval invasion operation", because you can't invade your own country.