Boris Johnson has demanded the “immediate release” of Nazanin Zaghari-Ratcliffe in a phone call with Iran’s president.

Ms Zaghari-Ratcliffe was released from house arrest and had her ankle tag removed at the weekend after a five-year prison term expired.

But she could face further charges and has been unable to return to the UK to be reunited with her husband and young daughter.

In a phone call with Hassan Rouhani on Wednesday afternoon, the prime minister told Iran’s president that the treatment of Ms Zaghari-Ratcliffe was “completely unacceptable”.

Mr Johnson demanded her “immediate release”, as well as that of other British-Iranian dual nationals detained in Iran.

A Downing Street spokesperson said: “He said that while the removal of Nazanin Zaghari-Ratcliffe’s ankle monitor was welcome, her continued confinement remains completely unacceptable and she must be allowed to return to her family in the UK.”

Mr Johnson and Mr Rouhani were also have to discussed the Iran nuclear deal, which new US President Joe Biden has said he wants to restore after his predecessor Donald Trump withdrew from the agreement in 2018.

“The prime minister also stressed that while the UK remains committed to making the Iran nuclear deal a success, Iran must stop all its nuclear activity that breaches the terms of the JCPoA (Joint Comprehensive Plan of Action) and come back into compliance,” the spokesperson added.

“He stressed the importance of Iran seizing the opportunity presented by the United States’ willingness to return to the deal if Iran comes back into compliance.

“The prime minister underlined the need for Iran to cease wider destabilising activity and be a positive force in the Gulf region.”

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