"What follows is a guide to what a conflict with North Korea might look like. War is inherently unpredictable: It’s possible Kim would use every type of weapon of mass destruction he possesses, and it’s possible he wouldn’t use any of them.

But many leading experts fear the worst. And if all of this sounds frightening, it should. A new war on the Korean Peninsula wouldn’t be as bad as you think. It would be much, much worse"

https://www.vox.com/world/2018/2/7/16974772/north-korea-war-trump-kim-nuclear-weapon