UK foreign minister Boris Johnson will travel to Tehran this weekend in a bid to win the release of Nazanin Zaghari-Ratcliffe, as well as settle a long-running £400m dispute that could help secure the British-Iranian mother’s freedom, The Guardian reported.

Nazanin Zaghari-Ratcliffe was sentenced to five years in prison in September 2016 for taking part in the mass anti-regime protests in 2009, which she denies.