What do North Korea's threats really mean for the US and the world?

Kim Jong-Un
This video grab taken from North Korean TV on March 20, 2013 shows North Korean leader Kim Jong-Un's overseeing a live fire military drill. Kim Jong-Un oversaw a live fire military drill using drones and cruise missile interceptors, state media said, amid heightened tensions on the Korean peninsula.
AFP/Getty Images/North Korean TV

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