• … if North Korea picks a fight with the US.

    This seems a bit unlikely and seems to be framed in the wrong way. The DPRK isn’t occupying any part of the US, while the US is currently occupying the Korean peninsula and now threatening to put it’s nukes there! When this is the starting point, it’s a bit strange to suggest that the DPRK could pick a fight when it’s already in a fight with the other party and it was that other party who picked the fight in the first place and keeps on trying to escalate. Not to mention that of the two countries concerned, one has started at least one fight in almost every year of it’s 200-year history and the other one is the peaceful DPRK.