Hydrogen bomb showed kimjong un was begging for war. Today america and south korea agreed to scrap a warhead limit on south koreas arsenal enabling it to strike north korea with greater force in the event of a military conflict. As if to emphasise the scaling up, south korea earlier carried out a simulated attack on north Koreas Nuclear test site. The us defence secretary james mattis warned pyongyang of a massive military response. Amid the deafening din of international diplomacy, what do we know about the 33 year old whom some believe has pushed the world the closest it has come in years to Nuclear Conflict . Heres our diplomatic editor mark urban on what we know about kim jong un. Kim jong un, ringmaster of the north korean circus, but a man who apparently has ordered generals who did not applaud enthusiastically enough to be executed, killed his own brother and now forges ahead with Nuclear Weapons, even if it threatens to impoverish his nation. Yet, and man also, who those who me