The nice thing about ballistic missiles is that the trajectory is pretty predictable. NORAD et al would have a pretty damn good idea of where it would come down within a minute or two of launch. The US ABM capability is not flawless, but I would be willing to bet that they could wax an errant ballistic missile if they had to, particularly given warning.
Of course, if it came to that North Korea would receive some decisive punishment. Mr. Ronery is certifiable, but I don't know if he is delusional enough for that.
They're not gonna fire a nuke at America. Even if they tried it wouldn't make it.
Thank you, and I think he IS delusional enough to try it.