After US leader hails successful prisoner swap as sign diplomacy can work, Zarif says it's up to the president to fix the broken international accord

After Tehran releases Michael White and US frees two Iranians, American president says 'it shows a deal is possible'

Mother of Michael White, who was arrested during July 2018 visit, says he is on his was back to America: 'The nightmare is over'

Sirous Asgari, who was cleared last year by Washington of stealing trade secrets, had his repatriation delayed by coronavirus crisis

Foreign Minister Zarif says Sirous Asgari on his way back to Iran; professor had been accused of trying to steal research from US Navy project

Government spokesperson says Tehran holds Washington responsible for health of Iranian prisoners held in American jails; Navy vet Michael White has been jailed in Iran since 2018