ICBMs. They've also made progress on submarine launched nuclear capable missiles. As coordinated strikes in Syria show, the US has an impressive capability for precision opening strikes. That has to worry Kim.

I tend to be on the more skeptical side. That threat of US force has historically pushed NK towards working harder for a nuclear capability, not to the bargaining table. Every time they have offered concessions, it was simply to stall action to buy that nuclear program more time. I'm not sure why this time is different.

Add to that history that Trump appears easy to win over with flattery, that he has waffled on traditional allies / obligations, and the liberal government now in South Korea, and you can see NK's calculation taking shape. Attempt to undermine the US / SK relationship by prying at Moon Jae-in (the rosy picture around the Olympics), and follow it up with yet another duplicitous deal with the West.

The only thing that gives me a bit of hope was the meeting with China recently. Xi may have attempted to lay down the law. We'll see, but count me as expecting a con job.