The state of North Koreans after a war involving them will be pretty bad. I think it would affect other countries and us as well.
A huge influx of refugees to the surrounding areas will cause an economic strain to the host countries that are trying to host and assimilate them. Nork will become a power strugle between the Chinese and the us/sk/ and Japan coalitions to take the resources of the area.
Why did Trump say this?
http://archive.is/mhlvV
>So North Korea, Mr. Kim, please do something nuke worthy.”