Iran's President Hassan Rouhani hailed an agreement with world powers over Tehran's nuclear drive, saying it would "open new horizons."
"Constructive engagement (in addition to) tireless efforts by negotiating teams are to open new horizons," Rouhani said on Twitter after intensive talks in Geneva produced a long-elusive accord.
Rouhani said the deal had been made possible due to "Iranian people's vote for moderation," referring to his surprise election victory in June.
Iran's Foreign Minister, Mohammad Javad Zarif, who had led the talks for the Islamic Republic, called the landmark deal an "important achievement" but only a "first step" towards a final accord.
"This is only a first step. It is an important achievement but it is a first step," Zarif told reporters.
He said the accord had a "clear reference that enrichment will continue" — an issue long seen as a stumbling block to a deal.