When I heard on the radio this morning that North Korea tested another nuclear weapon I jokingly wondered if they did so because of Pope Benedict resigning. After all that story dominated much of the international news yesterday, and North Korea loves to be the centre of attention. It's also a reasonable guess that the Roman Catholic Church is yet another of the numerous groups on North Korea's official "We hate these guys!" list.
More seriously no one is happy about this. Even China, the closest thing North Korea has to an ally, is not amused. It's a reasonable guess that North Korea has a ways to go to build a deliverable nuclear weapon. But if they keep this up it will happen, and it may encourage other states in the region to consider their own nukes. Japan for example could probably build a deliverable nuke fairly quickly, and adapting its space launch rockets into ballistic missiles wouldn't be hard for them either.