North Korean Nuke?

So, has North Korea successfully detonated the world's smallest nuclear weapon, blown up a kiloton of TNT to psych everyone out, or failed to detonate a larger nuclear weapon?

They sure look to me like the gang that couldn't shoot straight, after their recent missile imbroglio. Which is not to say that they couldn't wreak havok somewhere, if they're suicidal. I merely comment on the incompetence that ought to be expected from the form of government they employ.

I would suggest that the USA's next step be this: warn North Korean civilians to leave their cities.