We had the films and the drills in the US, too, although they stopped a long time ago. If you've been keeping up with the news, you know that N Korea does have missiles capable of reaching the US. I don't know why we wouldn't have enough warning to shoot them down before they get here.

I do believe that if N Korea launched a missile armed with a nuke warhead at us, it would likely be the last one. It would be a gesture of defiance, because they don't have a lot of them, and because the crazy man in the White House would likely obliterate them, regardless of who else would be affected.