Inside Story - North Korea: Altering the balance of power?

North Korea has carried out its third nuclear test in defiance of international criticism.

The test could bring North Korea one step closer to developing a warhead small enough to arm any of the many missile types it has stockpiled, which in turn would lead to other powers increasing their levels of nuclear deterence in a new and deeply dangerous arms race.

Many had hoped that Kim Jong Un would distance himself from the "military first" policies of his father.