North Korea is a proxy antagonizer to the US for China. NK would not exist if it were not for China. They will do nothing. Someone should offer the Kim father and son $10B, immunity, and their own island resort to leave and let Korea re-unify. When reunification finally happens and we learn the true hell 99% its citizens/slaves live in, modern society will be ashamed it did nothing for so long. Possibly the worst place on Earth.