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He had been expected to discuss the fate of detained dual national, Nazanin Zaghari-Ratcliffe, who is serving a five- year prison sentence for allegedly plotting against Iran's government. Her husband says she faces trial on new charges Sunday that carry the possibility of an additional 16-years imprisonment, but Iranian judiciary spokesman Gholamhosein Mohseni Ejehi said last month that her verdict has been finalised. London is considering repaying Tehran some 400 million pounds from a pre-1979 arms deal. Both sides say the money isn't related to Zaghari-Ratcliffe. Johnson met with Ali Akbar Salehi, the head of Iran's nuclear program, earlier Sunday.