North Korea: What 18 Months of Diplomacy Has and Has Not Achieved [August 5, 2019] [open pdf - 741KB]
From the Document: "Since President Trump agreed in March 2018 to hold a summit with North Korean leader Kim Jong-un to discuss North Korea's nuclear and missile programs, the Trump Administration's strategy has appeared to be based on the presumption that developing a leader-to-leader relationship will produce more results than the working-group approaches taken by previous administrations. [...] Overall, these diplomatic efforts have produced a marked reduction in tensions on the Korean Peninsula, and Trump and Kim appear to have developed a personal relationship that Trump says ultimately could produce a breakthrough. Kim has pledged to denuclearize, and has maintained a unilateral moratorium on nuclear tests and long-range and medium-range missile tests. Kim's public denuclearization promises, however, have been conditional and vague."
CRS Insight, IN11153
Congressional Research Service: https://crsreports.congress.gov/