SEOUL: North Korean leader Kim Jong Un inspected a naval base under construction, state media reported on Thursday, describing it as a “core undertaking” for maritime security.

The visit follows his pledge last week to possess “the most advanced and powerful warships” as the nuclear-armed state accelerates its ambitious naval expansion.

North Korea has been upgrading its navy in recent years, commissioning 5,000-tonne destroyers and testing ship-launched missiles.

Kim has pledged to equip the fleet with nuclear weapons and build larger 10,000-tonne warships.