By a curious geographical coincidence, neither North Korea nor North China nor North Post-USSR are known for their independent reality-based reporting and I take it as a given that North Korea would never start a war of aggression. If the North should ever march South (again) it will of course be as a completely righteous response against intolerable provocation and aggression from its eternal enemy, as confirmed by media duly approved by Moscow and Beijing.
They're looking more ready and eager to do that by the month, and with the present Global political situation, the respect for current status quo seems to be at a low.