The missile was the Pulhwasal-3-31 that North Korea said it was developing and tested last week, KCNA news agency said.

Kim inspected the construction of a nuclear-powered submarine, calling nuclear armament of its navy an urgent national agenda, KCNA said.

South Korea's military said the North fired multiple cruise missiles into the sea from its east coast on Sunday morning, without providing details.

(Reporting by Jack Kim; Editing by Andrew Cawthorne and Lisa Shumaker)