North Korea tested its new strategic cruise missiles for the second time in a week on Sunday, calling it a newly developed submarine-launched cruise missile, accelerating its navy's nuclear armament, state media reported on Monday. 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.

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State news agency KCNA and official Rodong Sinmun newspaper said the missiles flew above the sea off the country's east coast for 7,421 seconds and 7,445 seconds and hit an unspecified island target, indicating the flight time exceeded two hours. 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."

South Korea's military said on Sunday that the North fired multiple cruise missiles off its coast but did not provide details. Last week, the North said it had tested a new strategic cruise missile, indicating it was designed to carry a nuclear warhead, but at the time did not mention it was being developed for submarine launch. State media photographs published on Monday showed a missile launching into a cloudy sky from the water trailed by a plume of smoke which obscures the type of platform it was being fired from.

North Korea's cruise missiles are typically less controversial and are not explicitly banned under U.N. Security Council resolutions. However, analysts have said intermediate-range cruise missiles were no less a threat than ballistic missiles and are a serious capability for North Korea.

In recent months, the North has tested an array of weapons that include ballistic missile systems that are under development and an underwater drone. Kim separately inspected the construction of a nuclear submarine and discussed issues related to the manufacturing of other types of new warships, KCNA said but gave no details. North Korea last year launched what it called its first operational nuclear attack submarine, which analysts said appeared to be a modification from an existing submarine and likely designed to carry ballistic and cruise missiles.

There was scepticism over the real-world utility of such a vessel, especially compared to the more advanced land-based missile systems, because its diesel propulsion generates noise and is limited in range, according to weapons experts. Kim said at the time the country would accelerate the programme to build nuclear-powered submarines.