I've been to Korea a few times and have taken part in intelligence briefings.  I'd say there's a chance that in NK the acceptable outcome when Obama was president was a minimized destabilization of the NK regime and their immediate leadership capabilities. Emphasis on capability.

 With Trump (and really its the military command structure at this time combined with the S.A. Sea conventions as they are now) that the acceptable outcome is the elimination of the NK regime and the removal of their leadership capabilities.  Emphasis on removal.

 This is speculative based off experience, I have no evidence or references.

 I wondered about that but the talks were already in motion before 03 Sept.


 Also it takes all of 10 seconds to find contradictory information so who knows:

http://nationalinterest.org/blog/the-buzz/no-north-koreas-nuclear-test-site-w...

 Minimized destabilization is using only the amount of force necessary to stop the perceived current leadership from controlling national policy.

 Minimized elimination means using only the amount of force necessary to kill or permanently incarcerate the leadership that is perceived as controlling national policy.    

 Removing Assad is destabilization, killing Hussein is elimination.