Boris Johnson will elevate “grave considerations” over the imprisonment of Nazanin Zaghari-Ratcliffe when he arrives in Iran later.
The UK overseas secretary will name for the discharge of the British-Iranian lady, together with different twin nationals.
Mrs Zaghari-Ratcliffe is serving a five-year sentence over allegations of spying, which she denies.
Mr Johnson’s first journey to Iran comes amid rising tensions within the Center East.
In addition to the twin nationwide instances, Mr Johnson will talk about British considerations over Iranian involvement in conflicts within the area, particularly in Syria and Yemen.
BBC diplomatic correspondent James Robbins mentioned Mr Johnson’s journey to Tehran – solely the third made by a UK overseas secretary since 2003 – may “hardly be extra delicate”.
He added that the overseas secretary had been cautious to decrease any expectations of imminent launch for Mrs Zagahari-Ratcliffe, warning that such instances are very tough.
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Mrs Zaghari-Ratcliffe was arrested in April 2016 when on vacation to introduce her daughter Gabriella to household.
The kid has been residing together with her maternal grandparents in Iran for the final 20 months.
Mr Johnson was accused of risking a further 5 years being added to her sentence when he instructed a parliamentary committee that she had been in Iran to coach journalists.
In November, he apologised in the Commons, retracting “any suggestion she was there in an expert capability”.
Mr Johnson then met together with her husband, Richard Ratcliffe, to debate her case, together with requires her to be given diplomatic safety.
There have been concerns about Mrs Zaghari-Ratcliffe’s health after lumps in her breasts have been found, however these have been discovered to be non-cancerous.
Though not mentioning her by title, Mr Johnson mentioned: “I’ll stress my grave considerations about our twin nationwide consular instances and press for his or her launch the place there are humanitarian grounds to take action.”
The International Workplace wouldn’t affirm the names or variety of different individuals being held in Iran, saying their households had requested for his or her instances to be stored out of the general public area.
In his assertion, the overseas secretary listed subjects he would elevate together with his Iranian counterpart, Mohammad Javad Zarif, together with discovering a political resolution to the battle in Yemen and securing “higher humanitarian entry to ease the immense struggling there”.
He additionally mentioned he would underline the UK’s support for the 2015 nuclear deal – struck between Iran and 6 world powers – however “clarify” considerations over the nation’s exercise.
Mr Johnson added: “Iran is a big nation in a strategically essential, however risky and unstable, area which issues to the UK’s safety and prosperity.
“Whereas our relationship with Iran has improved considerably since 2011, it’s not simple and on many points we won’t agree.
“However I’m clear that dialogue is the important thing to managing our variations and, the place attainable, making progress on points that actually matter, even below tough situations.”