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
Definitely easier to invade the world's largest country than the worlds ~130th one, i am very smart pls give money Telegraph
With one of the biggest nuclear arsenal as well