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,

Kim Jong Un is aiming to increase North Korea's nuclear weapons capability as the U.S. remains cautious about the country's alliance with Russia in the Ukraine war.

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.