North Korea has revealed a new facility believed to be for nuclear weapons fuel production, with leader Kim Jong Un vowing 'exponential' growth of the country's nuclear arsenal. State media highlighted the plant's advanced technology.

North Korea on Thursday unveiled a new facility believed to produce fuel for nuclear weapons, with leader Kim Jong Un pledging to expand the country's nuclear forces “at an exponential rate.” State media said the plant uses advanced technology, while photos suggested it may be a uranium enrichment facility.