"Correspondents say the news marks a setback for efforts to present a unified front on Iran in the face of continued defiance from Tehran.
The Iranians are under UN Security Council sanctions for refusing to stop enriching uranium. "
"In his Nobel speech, Obama expounded on the concept of 'just war' and the necessity of the use of force.
"I do not bring with me today a definitive solution to the problems of war," Obama said. 'What I do know is that meeting these challenges will require the same vision, hard work, and persistence of those men and women who acted so boldly decades ago. And it will require us to think in new ways about the notions of just war and the imperatives of a just peace.'"