Secretary of State Mike Pompeo’s overnight visit to Pyongyang last week failed to demonstrate any progress on denuclearization talks, leading one source with knowledge of the discussions to say the White House felt it went “as badly as it could have gone.”

“The North Koreans were just messing around, not serious about moving forward,” the source told CNN’s Michelle Kosinski, adding that Pompeo had been promised a meeting with North Korea’s Kim Jong Un, and so not getting that meeting sent a big message.

“By now it’s abundantly clear that this approach is a dead end,” said Adam Mount, a senior fellow and director of the Defense Posture Project at the Federation of American Scientists, where he covers US nuclear strategy, deterrence and North Korea

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