In a series of tweets sent Friday night, Trump affirmed that the summit would take place on Feb. 27 and 28, something he had previously suggested during his State of the Union speech, and once again asserted that North Korea under KJU has the potential to become " a great Economic Powerhouse" which might "surprise some but won't surprise me, because I have gotten to know him & fully understand how capable he is."

Assuming that the North complies with US demands to abandon its nuclear arsenal, "North Korea will become a different kind of Rocket - an Economic one!"

The implication here is clear: Trump has some serious leverage over Kim, as he holds the key to admitting North Korea into the global economy, which could lavish immense economic benefits on the extremely impoverished country. That should be a pretty powerful incentive: Currently, half of NK's 25 million people live in extreme poverty, and 70% of its people depend on government assistance for food.