Iran and European Union hold high level talks in Tehran
17 April 2016 Last updated at 02:37 BST
EU foreign policy chief Federica Mogherini has held the highest level talks between European and Iranian officials for more than a decade.
Her visit to Tehran comes months after Iran complied with its obligations under last year's nuclear deal, which paved the way for the lifting of financial sanctions.
Lyse Doucet reports from Tehran.