North Korea tests underwater attack drone that can generate 'radioactive tsunami'
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North Korea's showing off an underwater nuclear attack drone it says can cause a 'radioactive tsunami,' but the threat is likely 'exaggerated'
n this undated photo provided by the North Korean government, North Korean leader Kim Jong Un inspects what it says unmanned..
Military tensions are at a high point as the pace of both North Korean weapons tests and US-South Korea joint military exercises..