North Korea has offered a rare glimpse into a secretive facility to produce nuclear materials as it says leader Kim Jong Un visited the area and called for stronger efforts to increase his nuclear weapons.

North Korea tested new tactical ballistic missiles using super-large warheads and modified cruise missiles on Wednesday led by leader Kim Jong Un, who called for stronger conventional weapons and nuclear capabilities,

North Korea test-fired a new ballistic missile carrying a super-large warhead and an improved strategic cruise missile, state media reported Thursday, as leader Kim Jong Un called for increased weapons development.