Top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un has ordered all nuclear strike means to be ready for action when he watched a firing drill of ballistic rockets, the official KCNA news agency reported Friday.

Photo provided by Korean Central News Agency (KCNA) on March 9, 2016 shows top leader of the Democratic People's Republic of Korea (DPRK) Kim Jong Un recently meeting with the scientists and technicians in the field of nuclear weapons and guiding the work for boosting the nuclear arsenal. [Photo/Xinhua]

Kim ordered all nuclear strike means of the military strategic force that targets South Korean combat command centers and U.S. military bases in the Asia Pacific region to be always ready for action and fight a decisive battle, the report said.

Kim underscored the need to "put greater spurs to developing nuclear weapons," which is a new goal set by the ruling Workers' Party of Korea, and to "dynamically push forward diversification of means for delivering nuclear warheads."

Emphasizing the need to strengthen cooperation between nuke research and rocket research, he instructed conduction of more nuclear tests in the future to estimate power of newly produced warheads and bolster nuclear attack capability.

Kim ordered the military to ensure "a prompt and safe operation of nuclear attack system" in utmost emergency scenario and "a unitary system of command and control over nuclear force."