But what will they accomplish except self destruction or takeover by either those that they attack or allies of same?
I doubt that a country without the ability to either feed its populace nor electrify its country can attack and hold even a few miles of South Korea.
Granted, there might be an attempt and destruction, but the repercussions would be disastrous for those in North Korea who would order such actions.
Such logic can be used on paper and not in real life however.
Like all jealous totalitarians they'll achieve sociopathic thrills at the misery and uproar they're causing.