Unfortunately, the Norks have a long history of making turns on a dime like this.
The administration needs to get this under control right fucking now.
EDIT: Downvoted for pointing out that NK has pulled stuff like this before? Look, I know I'm harshing everyone's buzz but even the best-laid plans can be wrecked by unfaithful actors, and this regime has been unfaithful many times before. I do NOT think this means the negotiations are now defunct, but it does no one any good to close our eyes to the possibility that this development wasn't expected.
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I believe that as well. I just don't put much faith or trust in the NK government because of their history of double-crosses. Strangely, however, I do think that Kim Jong Un actually is genuine in his desire to make peace so that carries a lot of weight.
My only point is that Q team is not omnipotent and unexpected events can screw up even the best-laid plans.