Abbas Mousavi, spokesman for Iran's Foreign Ministry, gives a press conference in the capital Tehran on May 28, 2019. (ATTA KENARE / AFP)

DUBAI — Iran is ready for further prisoner exchanges with the United States, Foreign Ministry spokesman Abbas Mousavi said on Sunday, according to the official IRNA news agency.

 “If the possibility of exchanging prisoners exists, we have the readiness to free the rest of the individuals who are imprisoned in America and return them to the country,” Mousavi said.

An Iranian-American doctor has returned to Iran, Iranian state media reported on Monday, after a swap deal between Tehran and Washington that resulted in the release of a US\Navy veteran detained in the Iran.

In a slight thaw in US-Iranian enmity, the United States allowed Majid Taheri to travel to Iran as part of the swap deal. Michael White, an American who said he contracted the coronavirus while detained in Iran, was freed last week.

In this image provided by the US State Department, Michael White holds an American flag as he poses for a photo, June 4, 2020, with US special envoy for Iran Brian Hook at the Zurich, Switzerland, airport after White's release from Iran. (PHOTO / US State Department via AP)

The government of Iran has done an extreme effort in order to help people like me who were somehow accused of violating the US sanctions

Majid Taheri, An Iranian-American doctor

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“The government of Iran has done an extreme effort in order to help people like me who were somehow accused of violating the US sanctions,” Taheri told state TV after his arrival at Tehran’s Imam Khomeini Airport, where he was welcomed by deputy Foreign Minister Hossein Jaberi-Ansari.

He said he had been punished by the United States for sending material to Iran to help a research group that was making vaccines.

Taheri, detained in the United States for 16 months for violating US sanctions, was freed on June 4 as Iran released White, who had been sentenced to 13 years in 2019 for insulting Iran’s supreme leader and posting private information online.

Taheri’s lawyer said he would visit family in Iran and seek medical treatment before returning to the United States. He had pleaded guilty to violating US sanctions, the lawyer added.

“My charges were futile and unfair,” Iran’s semi-official Fars news agency quoted Taheri as saying.

The prisoner swap deal is a rare bright spot in the relationship between the two foes that has grown more hostile since President Donald Trump took office in 2017. He exited a nuclear agreement Iran had signed with world powers, and reimposed sanctions that had been lifted under the deal.

Last December, Washington and Tehran worked on a prisoner exchange in which Iran freed US citizen Xiyue Wang, who had been held for three years on spying charges, and the United States freed Iranian Massoud Soleimani, who faced charges of violating US sanctions on Iran.

READ MORE: Iran frees American, US allows dual citizen to visit Iran in deal

Last week, materials science professor Sirous Asgari, 59, who was indicted by US federal prosecutors in April 2016 and acquitted in November 2019, returned to Iran. He tested positive for the coronavirus in April and US authorities had said he would be deported once he received medical clearance.

While both Tehran and Washington have expressed readiness for further exchange of prisoners, Iranian authorities have ruled out a wider negotiation with the United States as demanded by Trump administration.

The Swiss Foreign Ministry, which confirmed it played a role in what it called “the humanitarian gesture” on White and Taheri, said it “stands ready” to help further.