North Korea has removed all references to reunifying with South Korea from its constitution. The change signals a tougher, more permanent break between the two Koreas. North Korea expert Rachel Minyoung Lee, Senior Fellow for the Stimson Center's Korea Program, talks to Tomi Oladipo about what this means going forward. Chapter Breakdown 0:00 North Korea removes all references to reunification with South Korea from its constitution 0:18 Kim Jong Un labeled South Korea as a 'most hostile state' 0: