The US army shits on both China and Russias combined. Russia only has 1 aircraft carrier and its diesel powered, so they cant move their army, they gave up on their stealth fighter Su-57/T-50 and cancelled it, while China only has 1 nuclear powered aircraft carrier, only has 1 stealth 5th gen fighters, meanwhile the US has 20 aircraft carriers, multiple 5th gen stealth fighters and variants, are moving onto 6th gen fighters, stealth destroyers, other stealth ships, and just better overall weaponry. The US spends 7/8 times(depending where you look) more then the next leading nations on military. If you see the videos posted above of Vostok, imagine that 7/8 times over if the US decided to hold a battle game that large.
The US literally flies by China and all they do is meow at us(yes meow at 2:04) and tell us to go away.
The only thing to we worried about with Russia and China would be if they ever decide to use nuclear weapons, otherwise the US military shits on them in every way possible.