N.Korea says it simulated nuclear air explosion strike in missile launch, again tested nuclear-capable underwater drone

North Korea simulated a nuclear air explosion strike with two ground-to-ground tactical ballistic missiles during Monday's launch, state media KCNA said on Tuesday.

North Korean leader Kim Jong Un called for scaling up weapons-grade nuclear materials to increase the country's nuclear arsenal, saying it should be fully ready to use the weapons at any time, state media KCNA said on Tuesday.

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 North Korea's military again tested a nuclear-capable underwater weapon system that has the potential to set off a radioactive tsunami, Yonhap reported on Tuesday, citing the Korean Central News Agency.

According to Yonhap, the underwater system underwent tests from March 25-27.