Another tactic of negotiators is the carrot and stick approach. To put it bluntly: You make it clear that there will be unhappy consequences if one does not negotiate an agreement and a "gain" if one does reach an agreement. Since any unhappy consequences suffered by North Korea in the past had not been enough to drive their leader to significant negotiation, Mr. Trump and his team went to the United Nations to obtain more meaningful sanctions in December. His critics pointed out that these actions might further alienate North Korea and, further, that there would likely be widespread cheating. There were, of course, those risks. Nonetheless Mr. Trump gained a more potent economic stick.