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In the last month, they had developed into so-called "proximity talks", with both sides in the same two-storey building, according to multiple accounts from officials familiar with the details.

Mr Perriello scaled down his expectations and settled on proximity talks and phone calls - including from US Secretary of State Anthony Blinken - hoping to open roads for humanitarian access.

Iran refuses to hold direct talks with its arch-foe, the United States, resulting in the "proximity" talks arrangement involving Mora.

“There’s no sign there would be direct talks on the horizon between the two sides, nor is that necessary,” Feltman added, saying there are “a whole lot of ways to have political processes” including proximity talks.

The meeting in the Austrian capital, Vienna, is the first contact the United States and Iran have had in years, although it is through “proximity talks,” where the representatives of each country don’t actually sit in the same room.