Matteo Taerri, accused by Washington of trying to export equipment without license, calls charges 'futile and unfair' upon arrival in Iran

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'

Families of Americans held by Tehran fear for loved ones' safety, believe prospects for release dimmed following US strike on Qassem Soleimani