EU foreign-policy chief Federica Mogherini has announced plans to visit Iran on April 16 in an effort to seek closer cooperation with Tehran following a landmark nuclear deal.
Mogherini last visited Iran in July shortly after world powers agreed to lift sanctions in return for Tehran accepting strict curbs to prevent it acquiring nuclear weapons.
"We will discuss with the ministers on which grounds, on which issues, and sectors to reengage so as to reopen full relations," she said as she went into a meeting of EU foreign ministers in Brussels on March 14.
Mogherini made no mention of Iran's ballistic-missile tests this month. Western states have warned Iran risks new sanctions as a result.
British Foreign Secretary Philip Hammond said in Brussels on March 14 that Iran's missile tests were "unacceptable."