I assume by "B" you question the ability for Russia or China to physically and logistically invade the U.S.?
It took only a few years for the Russian fleet and Air Force to disintegrate from lack of maintenance after the fall of the USSR.
The same would likely happen with the U.S. a few years after anarchy or whatever variation of government-less reality we would entertain.
Russia could take Alaska in a weekend.
Russia and China could build up in Mexico over a few months time and choose the date they want to enter. They don't even need to invade east of the Mississippi. They can stop at the River, thumb their nose at the main population and hold 90% of the U.S.'s natural resources.
![[Linked Image]](http://militarysignatures.com/signatures/member651.png)
