Relations between the US and North Korea have escalated quite dangerously. President Donald Trump has promised "fire and fury" should North Korea cross the line and the latter has responded by calling Trump a "War merchant and a strangler of peace". So far it's only been a war of words between the two but could it escalate to a world war? Christopher Green from the University of Leiden tells us if that's possible and how the world should be dealing with North Korea.

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