Probably wouldnt be too hard, with North Korea being as poor and hard hit with sanctions as it is, there are few motor vehicles in the country, and in a war time scenario they would likely be using almost every single one (except for the personal vehicles owned by party elites) in a military capacity.

NK already has mandatory military service for 10 years starting at 17 years old. If they went to war they could just draft literally everyone else. Doubt you could consider anyone but the children and the elderly "civilians"

"unfortunately, there was just no way around it - they built their own weapons instead of buying them for billions each from Lockheed Martin, so the US government just had to murder hundreds of thousands of their civilians" said Spacemanspliff, ruefully taking a toke in memorial of the people who'd chosen to become victims of war crimes

No.

Destroying rocket launchers is a military objective. Killing civilians while trying to achieve a military objective is not a war crime. There is even a term for those civilians: "collateral damage".

However, killing civilians for its own sake, without a military objective, may be a war crime.

World war 3 let's go