Nothing is going to happen.... North Korea is now a nuclear power. As long as NK doesn't attack US or Allies, we will not do anything.
China just came out today to help cement this fact, by stating if North korea starts anything, China will remain neutral. if SK and US try to strike first China pledged to stop us.
Kim Jung Un just got invited to sit at the adults table for Thanksgiving. no more little kids table.
http://www.foxnews.com/world/2017/08...rea-first.html