North Korea nuclear threat: a reality?

North Korea has announced it intends to carry out nuclear testing, stating that it will deter a threat from the United States. But how realistic is this threat and what are the implications of North Korea's plans? Will the UN Security Council be forced to intervene? And what can Russia do, as a permanent member of the UN Security Council and a participant of the Six Party talks? Major-General Vladimir Dvorkin, a Member of the Russian Academy of Missile and Artillery Sciences, is on Spotlight to tell us more