North Korea building nuclear submarine

North Korean leader Kim Jong Un supervised the test of the missile, called "Pulhwasal-3-31," which is identical to the strategic cruise missiles that the North said last week were under development, Report informs, citing Reuters.

Kim called the test a success, KCNA said, "which is of strategic significance in carrying out the plan ... for modernizing the army which aims at building a powerful naval force."

Kim separately inspected the construction of a nuclear submarine and discussed issues related to the manufacturing of other types of new warships, KCNA said.