North Korean leader Kim Jong Un has vowed to accelerate his country's nuclear build-up and warned Washington against making a "wrong decision" after overseeing the launch of the country's most powerful ballistic missile, state media said Tuesday.
Monday's test launch of the solid-fuel Hwasong-18 came a day after the nuclear-powered submarine USS Missouri made port in Busan and followed a US-South Korea warning that a nuclear attack by Pyongyang would mean "the end of the Kim regime".
