The Choices Education Program recorded this talk at the Watson Institute to high school teachers by Jonathan Pollack, a leading expert on North Korea. The talk was in 2009, but most all is extremely relevant given the events there right now.
The talk has six parts, each fairly short, but packed with interesting information.
We also have a some additional resource suggestions here and a short curriculum with a roleplay, Conflict on the Korean Peninsula: North Korea and the Nuclear Threat.
The Choices Program is a national education initiative developed at Brown University's Watson Institute for International Studies. The Choices Program develops curricula on current and historical international issues and offers workshops, institutes, and in-service programs for high school teachers.