[Nonfiction]

China doesn't even have the naval and amphibious superiority to invade an island a few miles off of their coast, let alone invade thousands of miles away across an ocean. And in some hypothetical Russia + China vs US situation, the US would also have NATO (which now reaches all the way up to the Russian border), Japan, Australia, Canada, New Zealand, South Korea, and possibly India. Even if you give China and Russia Iran, North Korea, and the rest of the Shanghai Pact, they have no chance at all. The only way Russia + China could win a "war" against the US is if the war was entirely economic.