The Congressional Research Service “recently” published two reports which relate to the DPRK:
The U.S.-South Korea Free Trade Agreement (KORUS FTA): Provisions and Implementation
September 16, 2014: 2014-9-16-KORUS-Kaesong
June 2, 2011: Imports-from-North-Korea-2011
(Although this report focuses mostly on US-ROK issues, there is detailed discussion of the complex negotiations around the Kaesong Industrial Complex (KIC).)
Iran-North Korea-Syria Ballistic Missile and Nuclear Cooperation
April 16, 2014: 2014-4-16-Iran-Syria-Missile
You can download most former CRS reports dealing with the DPRK here.
