Kim Jong Un vows to expand his nuclear arsenal by building nuclear submarines, underwater missiles and warheads that can hit American cities

North Korea, Nuclear - Weapons - Threats - War, Wars & Rumours of Wars 1 Minute

Kim Jong Un vowed to expand North Korea’s nuclear arsenal during a key meeting of the ruling party this week, boasting that nuclear submarines, underwater missiles and warheads that could reach American cities were all under development, state media reported.

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