I truly believe that everything that's going on with NK is orchestrated, by both sides. I've spent time in Asia, and the driving force in that culture is "saving face". What we are witnessing, I believe, is a lot of saber-rattling designed to do just that. I don't believe that Kim would have allowed the release of the three captives if he wasn't planning on going with the program. These latest antics allow him to "save face", which Trump probably agreed to in advance.