North Korea unveils nuclear-powered submarine for the first time

North Korean leader Kim Jong Un visited a shipyard earlier (Korean Central News Agency/Korea News Service via AP)

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 US.

On Saturday, state media released photos showing what it called “a nuclear-powered strategic guided missile submarine”, as it reported leader Kim Jong Un’s visits to major shipyards where warships are built.