Neutron bombs, I don’t even know if they have electricity in most regions of NK.
I am partially serious.
They live the early 20th century, while just a few miles South is a booming economy with modern technology.
No neutron bombs, especially not against cave-based artillery. No nukes will be used even enhanced radiation like a neutron weapon. Having electricity or not having it doesn't reduce the effects of 'neutron bombs', but most of the terrain in NK doesn't favor their use.