It doesn't make sense. I mean if they are going to risk total annihilation, you'd think they would go for a bit more than this.
It would be hard to pin it on them.
There was something leaked a few weeks ago that said that DPRK had a three phase plan:
1) Saber rattling on nukes
2) Give a deadline to not “ensure safety” of foreigners
3) Terrorist attacks
Phase three was supposed to be in South Korea. I’ll see if I can find a link.