The only way to stop them is with a nuke preemptive strike.
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Exactly where would you target that nukestrike?
Virtually all serious DPRK military infrastructure is underground.
"Underground" -- as inside and deep beneath the "hollow mountain" at Latitude 39.078464°, Longitude 125.780545° -- with a traffic-free "highway to nowhere" running right through it -- and Soviet-style SAM installations on top...
No doubt, Little Fat Kid plans to be -- and stay -- in a very deep, luxurious, babe-equipped hidey-hole with a whole string of blast doors between his fat @$$ and the surface -- whenever he signals his toadies to "light her off"...
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Who do you plan to nuke? Millions of starved slaves?
Believe me I have considered this question from many angles.
We lost our chance when we let the norks get away with keeping our USS Pueblo and its crew...