The European Union foreign-policy chief said she expects economic sanctions against Iran to be lifted soon.
Iran and world powers agreed to a landmark nuclear deal to limit Iran's enrichment of uranium in exchange for lifting economic sanctions last year.
Federica Mogherini, speaking to reporters in Prague, said there was no date set yet but that "the implementation of the agreement is proceeding well."
Mogherini, speaking at a news conference after meeting Czech Foreign Minister Lubomir Zaoralek, said it was necessary that all steps agreed have to be "properly done."
But she said that "things are going well" and the sanctions might be lifted "rather soon."