London: The US has asked the UK to use its nuclear expertise to help dismantle North Korea’s arsenal, Britain’s foreign secretary Boris Johnson says.

The revelation came from an audio recording of a closed-door dinner meeting of an influential Conservative activists group, which Johnson was addressing.

Boris Johnson, Britian's foreign secretary Credit:Bloomberg

The recording was leaked to Buzzfeed.

Johnson is likely to face scrutiny over why he was divulging such sensitive material to the group, Conservative Way Forward, which says it was founded in 1991 to “build upon the achievements of our founding president Lady Margaret Thatcher and to adapt her values to British life today”.