I wonder what'll help when they hit Moscow too. They could very well hit China and the middle east. Certainly Chechnya would no longer exist.
Scary times.
This is why ballistic missile defense is still viable. People believe that a nuke attack will be terrorism oriented, and they're probably right. But a massive terrorist attack - five or more cities at once with 15 MT bombs - would definitely take us off the grid economically enough that we'd have to contemplate a ballistic missile counterstrike.
Our ability to launch that counterstrike without subjecting ourselves to one would be a definite benefit.
If we get hit by ANYBODY, I would think that China would be coming across the straight in bathtubs to invade Taiwan.
I'm sure (I hope) people in DC have thought of this, but they better be prepared to fight in 1 major and 1 minor world conflict while sustaining this kind of attack.
Oddly, the military infrastructure would not have suffered much at all under this kind of an attack.
Oddly still, the only country we can't afford to retaliate against is Russia, as they have Ballistic Missile Defense overwhelming ICBM capabilities. More oddly still, they aren't much farther along economically than they were when their empire fell.