US and Iran aim for final round of talks on reviving nuclear deal

Progress suggests agreement may be possible before Iranian presidential election in June

US and Iranian negotiators are are aiming for a final round of talks in Vienna next week on the terms for Washington's re-entry to the nuclear deal, the Iranian chief negotiator has said, implying a deal is possible before the Iranian presidential election in June.

The delegations, meeting in Vienna in a fourth round of talks, agreed on Wednesday to return to national capitals to receive final instructions on the remaining red lines before a definitive round of talks starting on Tuesday.