N. Korea's Nuclear-Powered Submarine a Threat to U.S., S. Korea: Defense Expert

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By Kama Hsu/Jeremy Olivier

North Korea's reported construction of a nuclear-powered submarine with ballistic missile capability is a threat to South Korea and the U.S., says defense expert Moon Geun-sik. Pyongyang revealed rare images of the prototype on Saturday, with some saying the country might be receiving technical assistance from Russia to build the vessel.