North Korea has unveiled for the first time what it says is a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the US.

North Korea has released the first images of its under-construction nuclear-powered submarine, which is likely being built with assistance from Russia. The nuclear-powered submarine can pose a major threat to Pyongyang’s immediate neighbor,

North Korea could be building a nuclear-powered submarine, possibly with Russian help, raising security concerns for the US and South Korea over its stealth attack capabilities