Since Nuka Cola isn't a real brand, what type of bottlecap will replace currency?
Seriously though, after being called "rocketman" KJU has changed his rhetoric from the people of NK to written in the first person and his ministers are saying an attack is inevitable. The new sanctions are likely pushing NK into a similar corner as the Japanese before WWII.
The serious question: What, if anything, could be done to de escalate this situation? While a nuclear attack on ConUS is unlikely, the use of nuclear weapons is becoming more likely. That's a situation that I believe no one wants.