Eager to save a 2015 nuclear accord with Iran from which the United States has withdrawn, the European Union has focused its efforts in trying to keep trade flowing with Iran in the face of renewed U.S. sanctions, in order to keep Tehran from pulling out.
Iranian state media say the country's foreign minister discussed ways of easing worldwide financial transactions during a meeting with British Foreign Minister Jeremy Hunt in Tehran.
The foreign secretary will call for the release of Nazanin Zaghari-Ratcliffe, a charity worker with joint citizenship who has been in jail for more than two years over allegations that she is a spy.
He is also due to discuss Iran's role in the conflicts in Syria and Yemen, and the ongoing cases of detained British-Iranian dual nationals. Her family denies this, saying she was in Iran to visit family.
"I have just heard too many heartbreaking stories from families who have been forced to endure a bad separation".
Mr. Hunt pressed his counterpart Mohammad Zarif on the case in September when they met in NY on the fringes of a United Nations General Assembly.
President Donald Trump has restored punishing sanctions on Iran since withdrawing the US from the 2015 nuclear accord earlier this year.
On Monday, the rebels said they are halting drone and missile strikes after a request from the United Nations.
"The Iran nuclear deal remains a vital component of stability in the Middle East by eliminating the threat of a nuclearised Iran", Hunt said, in a statement issued in London.
"It needs 100-percent compliance though to survive".
A senior Cuban official was quoted as saying by media that Havana was watching the progress of discussions between Tehran and Brussels over the creation of a "special goal vehicle" (SPV) which would provide a tentative solution for clearing payments to Iran normally banned under USA sanctions.
"But we also need to see an end to destabilising activity by Iran in the rest of the region if we are going to tackle the root causes of the challenges the region faces".