N. Korea's Kim calls for ramping up production of 'weapon-grade nuclear material'

North Korean leader Kim Jong-un (left) is seen inspecting a nuclear weaponisation project at an unknown location in North Korea in this photo taken on March 27. - KCNA VIA KNS/ AFP

SEOUL (AFP): North Korea's leader Kim Jong-un called for his country to expand production of "weapon-grade nuclear materials" and build more powerful weapons, state media reported Tuesday (March 28).

Kim's latest threat, a doubling-down on an earlier promise to ramp up nuke production "exponentially", came ahead of a US Navy carrier strike group's scheduled arrival in South Korea Tuesday.