It looks like the U.S. negotiators were not about to drop even limited sanctions for little to nothing in return:

North Korea’s top nuclear envoy on Monday said it was up to the United States to decide whether the two sides will hold further denuclearization talks, pending sufficient change from Washington on its position.
En route home to Pyongyang after much anticipated working-level discussions with the United States fell apart on Saturday, North Korea’s chief nuclear negotiator Kim Myong-gil told reporters at Beijing’s Capital International Airport that his recent exchange with the U.S. delegation was “sickening,” making clear his dissatisfaction with the United States’ unchanged position on denuclearization.
Joong Ang Ilbo
You can read more at the link, but I continue to believe that the North Koreans if they don’t get the limited sanctions dropped before the New Year, will create a “crisis” in order to get the deal they want.








