Three explanations for North Korea's nuke test, none of them good

The third possible explanation for North Korea’s action today is the least palatable: the possibility that, increasingly, nobody is really in charge in Pyongyang and that the country is beginning literally to run out of control. If North Korea suddenly imploded, the US and South Korea might come in from one side and China from the other, Foster-Carter warned. The danger of history repeating itself was, he said, a “baleful prospect”.