Here's a radical idea that just might work. Have Barack Obama invite Kim Jong Un over for a nice little chat over some ice cream desert, shake hands and hug. I bet Kim Jong Un would be so thrilled to meet Obama and to be treated as an equal, that he'll be more than willing to give up internationally destabilizing hostilities (including a lose-lose nuclear arms race) that puts the entire world at risk. Kim Jong Un just wants to be respected and loved by Obama and the rest of the world, and all his dangerous nuclear ambitions is merely a misguided, fear-based endeavor towards this ultimate objective.
https://sg.news.yahoo.com/north-korea-seeks-china-help-treaty-u-more-102612929.html