North Korea has unveiled for the first time a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the U.S. North Korean State media on Saturday released photos showing what it called "a nuclear-powered strategic guided missile submarine,

North Korea may soon seal its place in an exclusive global club after Kim Jong Un unveiled the country’s first nuclear-powered submarine under construction.

North Korea's nuclear-powered submarine, believed to be built with Russian technology, could pose major security concerns to neighbour South Korea and its ally, the US, due to its capabilities, experts say.