Iran confirmed on Friday that Foreign Minister Mohammad Javad Zarif had discussed prisoner releases with former U.S. ambassador Bill Richardson, a day after the two countries each released one detainee.
A ministry official had said in December that Richardson, a former U.S. envoy to the United Nations, had held talks with Zarif but played down their significance.
On Friday, ministry spokesman Abbas Mousavi said they had discussed the release of U.S. Navy veteran Michael White "months ago". White, detained in Iran since 2018, was freed on Thursday in exchange for the United States allowing an Iranian-American physician to visit Iran, his lawyer, and a U.S. official said.