It would be a close fight. China has more men to fight with. China also has more reserves. China has unquestionably better navies and air forces when compared to Russia, and around 9 times the amounts of tanks. China has the largest army in human history, more than the entire population of the United States. So, in a short war, China would win. In a longer war, China would win and begin to take Russian lands, eventually scoring the victory.This is of course assuming no nuclear weapons are used. Otherwise, China would also win.Answer:China would win without really trying.