They are bombing precisely because they haven’t got any weapons. If they had weapons, their nuclear weapons programme wouldn’t be attacked. This is how N Korea gets away with its shit. The attack is because they almost have nuclear weapons, and is intended to ensure the programme doesn’t bear fruit.

Nuclear weapons need a very precisely placed and timed set of shaped explosions within the device in order to ram the material together in such a way as to achieve fission. Nuclear weapons cannot be detonated by exterior explosions, fire, earthquake, hurricane or anything else other than its own detonation system.