Well, I've lived in South Korea during most of North Korea's nuclear career. They tested another one.
Each time they do one of these tests, I can't help but reflect for a moment how bizarre the whole thing is – South Korea is this prosperous, moderately well-adjusted OECD member nation, but they have this neighbor, you see… a crazy uncle, no less, who throws rocks at passing cars and sits in his yard playing with his gun collection and shooting targets in his kitchen. Further, everyone knows he beats his children and locks them in the basement, and he comes around asking for handouts every few months because he's run out of money.
What do you do with a crazy uncle neighbor like that?