Kim urges N Korean experts to produce ‘powerful nuclear weapons’

North Korea’s leader Kim Jong Un has called on his country’s scientists to expand production of “weapon-grade nuclear materials” and build more powerful weapons, state media has reported.

Kim’s latest calls, a reiteration of an earlier promise to ramp up nuclear weapons production “exponentially”, came ahead of a United States Navy carrier strike group’s scheduled arrival in South Korea on Tuesday.

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 North Korea on Monday simulated a nuclear explosion using ground-to-ground ballistic missiles, the Korean Central News Agency reported on Tuesday.

The report said the simulation was performed at an altitude of 500 meters.