"The Missile Administration of the DPRK successfully conducted test-fires of the new-type tactical ballistic missile Hwasongpho-11-Da-4.5 and an improved strategic cruise missile on Wednesday," KCNA reported.
The purpose of the test launch was to confirm the accuracy of hitting a target with a super-large warhead at a distance of up to 320 kilometers (200 miles) and the assessment of the warhead's explosive power, the news agency added.
The North Korean leader personally supervised the test launches and expressed satisfaction with the results, KCNA said.
"He said that such tests and steady improvement of performance of weapons and equipment through them are directly related to the grave threat of outside forces to the state security environment of the DPRK," KCNA reported.
Kim Jong UN reportedly said that the current regional situation, which "threatens North Korea's security," requires prioritizing military strength.
On Wednesday, the South Korean military said that North Korea had launched several short-range ballistic missiles that flew about 400 kilometers (249 miles). South Korea condemned the launches as a threat to regional peace, while Japan lodged a protest, citing regional security concerns.