From the Summary: "U.S. economic sanctions imposed on North Korea are instigated by that country's activities related to weapons proliferation, especially its tests since 2006 of nuclear weapons and missile technology; regional disruptions; terrorism; narcotics trafficking; undemocratic governance; and illicit activities in international markets, including money laundering, counterfeiting of goods and currency, and bulk cash smuggling. [...] The U.S. sanctions are a result of requirements incorporated into U.S. law by Congress, decisions made in the executive branch to exercise discretionary authorities, and obligations placed on member states of the United Nations by the U.N. Security Council. Though the President, in accordance with the Constitution, leads the way in conducting foreign policy, Congress holds substantial power to shape foreign policy by authorizing and funding programs, advising on appointments, and specifically defining the terms of engagement in accordance with U.S. political and strategic interests. This report presents the legislative basis for U.S. sanctions policy toward North Korea. These sanctions are a critical tenet of the larger bilateral relationship, and this report highlights Congress's role and responsibility in determining the nature of U.S.-North Korea relations."
CRS Report for Congress, R41438
Congressional Research Service: https://crsreports.congress.gov/