From the Document: "North Korea has posed one of the most persistent U.S. foreign policy challenges of the post-Cold War period. Having made advances in its nuclear and missile capabilities under its leader, Kim Jong-un, North Korea has evolved into a grave security threat to the United States. The United States and North Korea (officially known as the Democratic People's Republic of Korea, or DPRK) began denuclearization talks in 2018, but those negotiations essentially have been frozen since February 2019, with little apparent prospect for a breakthrough. Meanwhile, North Korea simultaneously has continued to develop its nuclear and missile capabilities. Other U.S. concerns include North Korea's cyberspace activities, conventional military capabilities, egregious human rights violations, international terrorism, and illicit activities such as money laundering and smuggling."
CRS In Focus, IF10246
Congressional Research Service: https://crsreports.congress.gov/