The following is an Insight article published by Reuters, September 10, 2023, reprinted with no changes.

Authors: Hafezi and Andrew Mills

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When $6 billion of unfrozen Iranian funds are wired to banks in Qatar as early as next week, it will trigger a carefully choreographed sequence that will see as many as five detained US dual nationals leave Iran and a similar number of Iranian prisoners held in the US fly home, according to eight Iranian and other sources familiar with the negotiations who spoke to Reuters.

As a first step, Iran on Aug. 10 released four US citizens from Tehran’s Evin prison into house arrest, where they joined a fifth, who was already under house arrest. Later that day US Secretary of State Antony Blinken called the move the first step of a process that would lead to their return home.

They include businessmen Siamak Namazi, 51, and Emad Sharqi, 59, as well as environmentalist Morad Tahbaz, 67, who also holds British nationality, the US administration has said. The Tahbaz and Shargi families did not respond to requests for comment. A lawyer for the Namazi family declined to comment.

The identities of the fourth and fifth Americans, one of whom according to two sources is a woman, have not been disclosed. Reuters couldn't establish which Iranian prisoners, in turn, would be swapped by the US.

At the centre of the negotiations that forged this deal between the superpower which Iran brands the "Great Satan”, and the Islamic Republic which Washington calls a state sponsor of terrorism is the tiny but hugely rich state of Qatar.

Doha hosted at least eight rounds of talks involving Iranian and US negotiators sitting in separate hotels speaking via shuttle diplomacy, a source briefed on the discussions said, with the earlier sessions focused mainly on the thorny nuclear issue and the later ones on the prisoner releases.

Doha will implement a financial arrangement under which it will pay banking fees and monitor how Iran spends the unfrozen cash to ensure no money is spent on items under US sanctions, and the prisoners will transit Qatar when they are swapped, according to three of the sources.

"Iran initially wanted direct access to the funds but in the end agreed to having access via Qatar," said a senior diplomat. "Iran will purchase food and medicine and Qatar will pay directly."

Reuters pieced together this account of previously unreported details about the extent of Qatari mediation of the secret talks, how the deal unfolded and the expediency that motivated both parties to clinch the prisoner swap deal. Reuters interviewed four Iranian officials, two US sources, a senior Western diplomat, a Persian Gulf government adviser and the person familiar with the negotiations.

All of the sources requested anonymity because of the sensitivity of a deal which hasn’t been fully implemented.

A State Department spokesperson said the US was not ready to announce the exact timing of the prisoner release. The Department also declined to discuss the details of what the spokesperson termed "an ongoing and highly sensitive negotiation.”

‘YOU CAN BUILD TRUST’

The US administration has not commented on the timing of the funds transfer. However, on Sept 5, South Korean foreign minister Park Jin said efforts were under way to transfer Iran's funds.

"The US-Iran relationship is not one characterized by trust. We judge Iran by its actions, nothing else," the State Department spokesperson added.

Washington consented to the movement of Iranian funds from South Korea to restricted accounts held by financial institutions in Qatar, but no money is going to Iran directly, the spokesperson added.

Qatar’s Ministry of Foreign Affairs did not respond to Reuters' request for comment on the details of negotiations, Qatar’s role in the talks or the terms of the final agreement.

Iran’s foreign ministry and its UN mission did not respond to detailed questions regarding this story.

The sources' account of the negotiation shows how the deal sidestepped the main US-Iran dispute over Iran's nuclear aims, culminating in a rare moment of cooperation between the long-time adversaries, at odds on a host of issues from Iran's nuclear program to the US military presence in the Persian Gulf.

Ties between the US and Iran have been at boiling point since Donald Trump quit a nuclear deal with Iran as US president in 2018. Reaching another nuclear deal has gained little traction since then, as President Joe Biden prepares for the 2024 US election.

The State Department spokesperson also said there had been no change in Washington's overall approach to Iran, "which continues to be focused on deterrence, pressure and diplomacy."

Once the funds are transferred, they will be held in restricted accounts in Qatar, and the US will have oversight as to how and when these funds are used, the State Department spokesperson added.

The potential transfer has drawn Republican criticism that Biden, a Democrat, is in effect paying ransom for US citizens. But Blinken told reporters on Aug 10 the deal does not mean that Iran would be getting any sanctions relief, explaining that Washington would continue to push back "resolutely against Iran’s destabilising activities in the region".

The Qatari-led mediation gained momentum in June 2023, said the source briefed on the discussions, adding at least eight rounds of talks were held since March 2022, with earlier rounds devoted mainly to the nuclear issue and later ones to prisoners.

"They all realised that nuclear (negotiation) is a dead end and shifted focus to prisoners. Prisoners is more simple. It’s easy to get and you can build trust," he said. "This is when things got serious again."

PRISONERS EXPECTED TO TRANSIT QATAR

The Iranian, diplomatic and regional sources said that once the money reaches Qatar from South Korea via Switzerland, Qatari officials will instruct Tehran and Washington to proceed with the releases under the terms of a document signed by both sides and Qatar in late July or early August. Reuters has not seen the document.

The transfer to banks in Qatar is expected to conclude as early as next week if all goes to plan, the source briefed on the talks said. Reuters was unable to identify the banks involved.

“American prisoners will fly to Qatar from Tehran and Iranian prisoners will fly from the US to Qatar, and then be transferred to Iran,” the source briefed on the talks told Reuters.

According to two Iranian insiders, the source briefed on the negotiations and the senior Western diplomat, the talks' most complex part was arranging a mechanism to ensure transparency in the money transfer and respect for US sanctions. The $6 billion in Iranian assets – the proceeds of oil sales – were frozen under sweeping US oil and financial sanctions against Iran. Then president Trump in 2018 reimposed the sanctions when he pulled Washington out of a deal under which Iran had restricted its nuclear program.

Issues discussed included how to ensure Iran only spent the money on humanitarian goods and securing guarantees from Qatar on its monitoring of the process.

"To salvage the negotiations from collapse, Qatar pledged to cover the banking fees for the funds' transfer from Seoul to Switzerland, and subsequently to Qatari banks, while also taking on the responsibility of expense oversight," an Iranian insider briefed about the talks told Reuters.

The central bank governors of Iran and Qatar met in Doha on June 14 to discuss the funds transfer, a second Iranian insider and the source briefed on the talks said.

The Central Bank of Iran and the Qatar central bank declined to comment .

The talks were led by US Special Envoy for Iran Robert Malley -- now on unpaid leave because his security clearance is under review -- and by US Deputy Special Envoy Abram Paley and Iran's chief nuclear negotiator, Ali Bagheri Kani, said one Iranian official, two sources briefed on the negotiations and the Western diplomat.

Mehdi Safari, Iran’s deputy foreign minister for economic affairs, joined the Iranian delegation at two meetings in Qatar for talks on the funds transfer, one senior Iranian diplomat told Reuters. Qatari Minister of State at the Foreign Ministry Mohammed Al-Khulaifi was the go-between mediator.

Malley declined to comment. Paley, Kani and Al Khulaifi could not be reached directly for comment.