Kim Jong-un, North Korea’s supreme leader, has inspected a newly constructed submarine, the official Korean News Agency (KCNA) has said.
The submarine, built with "special intention" from Kim, will enter service in the East Sea, also known as the Sea of Japan, the agency said.
The agency did not disclose the type of weapons systems contained in the submarine or when Kim inspected them.
The agency said Kim expressed great satisfaction with the construction of "our strong submarine type."
“The operational capacity of a submarine is an important component in national defence of our country bounded on its east and west by sea," Kim said.
North Korea should "continue to develop our national defence capabilities by making significant efforts to develop our naval weapons equipment, including submarines," he said.
Official media said Kim had commissioned military and scientific officials to work with him on further strategic initiatives in the use of submarines.