Exactly. The questions are “how” and “when”, not “if.”
I would not use nukes. Barrages of missiles on various sites and try to take the guy out at the same time (don’t know how well we can locate him) Tell the chinese and russians two hours in advance to stay out.
Get back up from Japans and let South korea stay out. The future of NK is with South Korea economically and for every other reason.
Tell china if we can denuke NK and get rid of the guy and untie the country we will leave the peninsula milirarilly and just do business.