I actually think they will. They know that China aren't supporting them as much as they used to. They're running low on food, they barely have electricity and their Juche ideology isn't going to last. I think Kim Jong-Un wants to be a hero by doing what his father never did. I think he wants war! I mean, what's the point of having a huge army if you never use it?

I would guess he is trolling. Anything else would be really stupid.