I hope by the double negative that you mean that Obama DID do something. ... Obama enforced already imposed santcions (from the Eisenhower era) and actually contunued a cash incentive (Clinton era) for DPRK.
Blaming Obama or Trump for creating this situation is as ridiculous as blaminig Truman for not nuking them in the first place, or Eisenhower for the DMZ. This situation was created by Kim Jong Un.....
There comes a time when you have to put aside partisan politics and see it for what it is, an impossible situation with an evil dictator. One thing that Hillary Clinton, Donald Trump, Barack Obama, and Bill Clinton would all agree on us that Kim Jong Un is a bad guy who has had enough chances.