Yet again your showing you never bothered to read the article you linked let alone understand the time and conditions that it was written under. Go back there with someone else and ask them to read it to you and explain it to you with a clear mind if that's possible.
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The one person who has escalated the NK problem more than anyone else in history is.. Donald Trump, and through his stupid fucking temperament, lack of political experience and total lack of understanding in Nk.. is leading the whole world to nuclear war.
Building a nuke for NK when they sit on one of the biggest mountains of uranium in the world has only ever been a matter of time, its not really that difficult for them to achieve, rogue scientist's from MANY countries have contributed to that since the 1950's.
Someone in the past few years has provided them with rocket technology which takes this from a local problem to a worldwide one.
Here's a good starting point to understand which country in the world that might of been.
https://en.wikipedia.org/wiki/Hwasong-14
America is not greater and the world is not safer with Bozo the clown trying to run it.