Why did efforts to negotiate with North Korea stall in 2019?

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Efforts to negotiate with North Korea stalled in 2019 primarily due to the breakdown of the summit between North Korean leader Kim Jong-Un and U.S. President Donald Trump in Hanoi, Vietnam, in February of that year.12

During these talks, North Korean negotiators requested the removal of some or all U.S. economic sanctions as a prerequisite for taking further steps in the denuclearization process. Because the two sides held differing accounts of the details and could not reach an agreement, formal discussions collapsed shortly after they began, yielding little concrete progress.13

While this summit failed to produce a breakthrough, it did not immediately end the period of detente, as evidenced by a subsequent meeting between Trump and Kim at the demilitarized zone in June 2019.13