The military option that makes sense, is to first determine where all the nuclear weapons and weapon development areas are, and destroy those using conventional weapons (if possible, Tomahawks, though those are not capable of penetrating hardened targets). Then immediately warn NK that if even one missile is fired at SK, then nukes will be fired at Pyonyang, and optionally other large population centers. This is the best strategy to avoid a (one-sided) nuclear war. A second option is after determining exactly where Rocket Man will be at some particular time, eliminate him, and then destroy all NK's nuclear stuff.