DPRK and Change

The issue with North Korea DPRK is that the regime/the government is quite secure compared with the Governments of Russia, Georgia, France, Spain, UK.
장성택 or Jang Son Taek has been the Vice Chairman of the NDC since 2010 and may well be the next DPRK Premier/Head of State under Kim Jong Un.
Jang also has the connections, education and has the credentials to replace Kim Jong Un if circumstances go that way. At the moment Jang is the Supreme Leader's chief adviser on military and political matters. Although we may wish the regime to change in DPRK North Korea this is highly unlikely to happen, and should the leader change, well, there are fresh leaders also waiting. DPRK cannot be changed through force of war. So we must therefore deal with, negotiate with, sanction DPRK rather than just get upset with them simply because they are the worst government on earth. As well as being the worst government on earth they are also one of the most secure governments on earth.