You’re both assuming they didn’t buy or steal a nuke from Russia a few years back.
Why can’t the NOKOs put the missle on a ship and sail within range of the US? If they don’t have the ability to hit us from there, put the entire launching system on a boat and float it closer to the target. Certainly they have the ability to do that.
That is possible... but then they would have used it by now.
LLS
NK had several nuclear tests, and they were not that massive. A nuke made by a member of the nuclear club would have produced far more energy; it's also very unlikely that NK can keep buying or stealing as many nukes as they need. Buying is right out, considering that NK is poor and has nothing to offer to developed countries.
We know that NK has domestic nuclear industry, and we know that have some hackers reworking old rocket designs from all over the world, trying to put something together. By all indications NK's rockets and nukes are made there; perhaps there was help from Pakistan or Iran.