We all know the denuclearizing will be a long process, just by the dangerous nature of nuclear material itself. I expect this to be a bumpy ride, there's no way it can't be. The upside is the meetings continue...and SKorea is moving on this as well. Give it the time it needs...and don't forget there's a lot of people on this side working against Trump being successful in this.
They are stalling. There is a lot of analysis out there that denuc can actually occur realistically speaking much more quickly, more quickly than the very slow pace they are purposely doing and trying to shift the discussion to Peace Treaty and US withdrawal from the peninsula first. Which is what they have always done. Its even got a name in Korean. Called the salami strategy