"Rogue nation". The "greatest immediate threat". North Korea has been called many things, few of them complimentary. The government has been accused of brutally oppressing citizens while ruthlessly pursuing the development of nuclear weapons. In recent months it held its fifth nuclear test, launched several missiles and - most believe - assassinated its leader's half-brother using a chemical weapon. But why is North Korea such a problem - and why can no solution be found?
Dr John Nilsson-Wright, University Senior Lecturer in Modern Japanese Politics and International Relations and Senior Research Fellow in the Asia Programme at Chatham House, is extensively quoted in a new BBC World News Asia website article looking at these questions and other aspects of the current North Korea situation.