While everyone is worried out north Korea. Chinese and Russian subs are secretly off both coasts of the US. China and Russia will join forces to crush the US because of our current weak ass President.
China will attack the West-- Russia will attack the East. The US could not defend such an attack successfully.
China and Russia would split their booty. China would also control all of Korea, since the US would be far too busy to worry about it- and the Chinese and russians have far too many assets to be concerned about our little army.