North Korea’s Nuclear Test Site Has Caved In, Geologists Suspect

It means North Korea may have reached a decision point, if Nuclear advancement is at this point impossible (at least for the short term)... it will either have to use it's current assets to inflict great harm on it's enemies, or use them as bargaining chips in negotiations. They will hopefully stick with the latter alternative.

Wouldn't be surprised if it did.

This is why he is coming to the table...he is running out of real estate because he jacked up all of his.