What we know about North Korea's nuclear arsenal

North Korea has long maintained that its nuclear arsenal is necessary to deter an invasion by the US troops.

    North Korea's nuclear programme has been shrouded in secrecy for years.

    In September 2016, North Korea conducted its fifth nuclear test and announced it had standardised the production of nuclear warheads.

    Pyongyang has long maintained that its nuclear arsenal is necessary to deter an invasion by the US troops.

    Al Jazeera's Andrew Chappelle takes through what we know.


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