WASHINGTON - US President Barack Obama on Thursday said a framework agreement reached at talks on Iran's nuclear program is 'a good deal' that would, if fully implemented, prevent Iran from obtaining a nuclear weapon. 'Today, the United States, together with our allies and partners, has reached an historic understanding with Iran, which if fully implemented, will prevent it from obtaining a nuclear weapon,' Obama said in statement at the White House. 'If this framework leads to a final comprehensive deal, it will make our country, our allies and our world safer,' he said. 'It is a good deal,' Obama added.