If North Korea fires a nuclear missile, how would the U.S. stop it?

The article misses the key point which is worrying the Pentagon - if NKorea launches a missile, the trajectory goes over Russian airspace (the world is a sphere, so the shortest distance between NKorea and USA is over mainland Russia). If the USA had a missile which can intercept the ICBM, it would have to launch it very early and towards Russia if it stands a chance of hitting it while it is at it's most predictable trajectory and slowest speed. What do you think the Russian Nuclear deterrence program will do when it detects a USA missile heading towards Russia? Hint - it will fire 2000 projectiles back. There was a serious panel by serious military analysts about 3 months ago where they discuss the impossibility of stopping a NKorean missile since it's trajectory goes over Russia.

The clickbaiting never ends. WaPo is worse than youtube pranksters.