#WHYS: What do you want to know about North Korea?

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Today Kim Jong-un condemned US B-2 bombers flying over South Korea as a "reckless phase" that represented an "ultimatum that they will ignite a nuclear war at any cost on the Korean Peninsula". Is war on the horizon? How real is the latest threat from Kim Jong-un? And, who is responsible for the recent escalation in tension between the US and the young dictator?