What is your opinions should the US in best intentions pressure and test N. Korea and see if they react ?
I in my mind see them as a larger threat than Iran with WMD's and have them to be used now unlike Iran.
If we wait and let Korea continue its path it will have all means for a preemptive attack.
Their largest Allie China has turned against them and they will now feel cornered.
When a small animal is cornered it will attack out of desperation.