Is USA preparing for a nuclear war in NK?

http://en.people.cn/n3/2017/0502/c90000-9209996.html

I think this is just a scare tactic deployed by USA to frighten NK into giving up its nuclear programme and force Kim to return to the round table discussion.  I hope that Kim will be succumbed to submission and not harbour a do or die attitude.  Kim has to put up a brave front or he will lose his respect and leadership.  This is something that cannot be taken lightly because he will go all out to save his face.

China also will not allow any nuclear war in NK because it will affect China's borders.