Obama made an unprecedented videotaped appeal to Iranians last week, in what some dubbed "YouTube diplomacy," offering a new beginning in diplomatic engagement.
Iranian leaders dismissed his overture as rhetoric and demanded concrete action.
"Some people said, 'Well they did not immediately say they were eliminating nuclear weapons and stop funding terrorism.' Well, we did not expect that. We expect that we are going to make steady progress on this front," Obama said in a nationally televised news conference.