Kim Jong Un vows to ‘exponentially’ increase nuclear warheads

North Korean leader Kim Jong Un attends the sixth enlarged meeting of the eighth Central Committee of the Workers' Party in Pyongyang, North Korea. (Undated photo from the Korean Central News Agency via Reuters)

SEOUL: North Korean leader Kim Jong Un vowed to dramatically boost production of nuclear warheads and to build a new long-range missile, according to year-end comments published by state media Sunday.