Johnson meets Iranian president on second day of talks
UK Foreign Secretary Boris Johnson has had a "worthwhile visit" to Iran and met President Hassan Rouhani on a second day of talks in the country.
A Foreign Office spokesman said both "spoke forthrightly" on several issues, including the case of jailed British-Iranian Nazanin Zaghari-Ratcliffe.
The mother-of-one has been held in Iran since April 2016 on charges of spying, which she denies.
The spokesman said "progress in all areas" had been agreed.
However, Mrs Zaghari-Ratcliffe remains in prison and it is unclear whether the talks will affect her case.
On Saturday Mr Johnson urged his Iranian counterpart to release Mrs Zaghari-Ratcliffe and other dual nationals on humanitarian grounds.
In two hours of talks, Mr Johnson and Mohammed Javad Zarif also discussed "the obligations of all parties to implement the nuclear deal", Iran's foreign ministry said.
US President Donald Trump has made his opposition to the deal, struck in 2015, very clear and has threatened to scrap it. But the UK continues to support it. In October when Mr Trump threatened to tear the deal apart, the UK, France and Germany said it was "in our shared national security interest" that its arrangements continue.
A Foreign Office spokesman said: "We leave with a sense that both sides want to keep up the momentum to resolve the difficult issues in the bilateral relationship and preserve the nuclear deal."
- What is the Zaghari-Ratcliffe case about?
- Nazanin Zaghari-Ratcliffe: Caught in Iran power struggle
- The uncertain fate of Iran's jailed dual nationals
- Global powers defy US over Iran deal shift
On Saturday, Richard Ratcliffe, who has been campaigning for his wife's release, said he hoped Mr Johnson would be "persuasive and charming and build a good relationship".
It is thought that Mrs Zaghari-Ratcliffe faces a possible court appearance later on new charges.
BBC diplomatic correspondent James Robbins said the president's powers were limited as he is not Iran's supreme leader.
Many in Iran are suspicious of the UK
Analysis by the BBC's security correspondent Frank Gardner, in Bahrain
It is still too early to tell how or even if this will produce any tangible results. All of those Boris Johnson is meeting in Tehran are considered pragmatists – they mostly favour bringing Iran out of international isolation and ending past disagreements.
But behind them lies an all-powerful "deep state", which includes the Revolutionary Guards Corps, the judiciary, and the intelligence and security apparatus.
These arch-conservative guardians of the Islamic revolution are deeply suspicious of the West and especially of the UK because of its historic role in the 1953 coup.
So the foreign secretary may well receive some encouraging signs from those he meets – but that may not necessarily reflect the views of others in Iran who hold enormous influence.
Mrs Zaghari-Ratcliffe was arrested on a visit to see her parents with her infant daughter Gabriella.
After the arrest, her daughter's passport was confiscated and for the last 20 months the three-year-old has been living with her maternal grandparents in Iran.
Iran does not recognise Mrs Zaghari-Ratcliffe's dual citizenship and will not allow UK representatives to see her in prison.
The case was further complicated when Mr Johnson erroneously told a parliamentary committee in November that Mrs Zaghari-Ratcliffe had been in Iran to train journalists.
The foreign secretary later apologised in the Commons, retracting "any suggestion she was there in a professional capacity".
But she now faces new charges of spreading propaganda, which could double her sentence.
Last month, the Free Nazanin Campaign said Mrs Zaghari-Ratcliffe had suffered panic attacks, insomnia, bouts of depression and suicidal thoughts and had been given a health assessment.
Media playback is unsupported on your deviceMr Ratcliffe said he believed the foreign secretary's presence in Iran would "make a difference", but the situation remained very unclear.
"It's all up in the air," he said. "We're holding on to the good bits – it could go any which way."
He said he wanted his wife to be with her family in the UK for Christmas but he was not expecting her to be on the plane when Mr Johnson returns to the UK on Monday.
He added: "Fingers crossed it can be solved by Christmas, which means in the week or so afterwards there might be a happy outcome."
Media playback is unsupported on your deviceThe Foreign Office would not confirm the names or number of other dual nationals being held, saying their families had asked for their cases to be kept out of the public domain.
Relations between the UK and Iran have long been difficult. Mr Johnson's visit is only the third by a British foreign minister to Iran in the last 14 years.
