April 6, 2013 - EU High Representative Catherine Ashton says that after two days of negotiations between Iran and the six world powers (the United States, France, Britain, Germany, China and Russia), the two sides "remain far apart" on Tehran's controversial nuclear program.
April 9, 2013 - State-run TV reports that Iran opened a uranium-processing facility as well as a uranium mine in the central province of Yazd, to mark "National Nuclear Day."
September 24, 2013 - At a speech at the U.N. General Assembly Iranian President Rouhani says "Nuclear weapons and other weapons of mass destruction have no place in Iran's security and defense doctrine, and contradict our fundamental religious and ethical convictions."
October 16, 2013 - The latest discussions between Iran and the six world powers center on a proposal put forth by Iran to recognize the peaceful nature of its nuclear energy pursuits. The meeting is described as "substantive and forward-looking."
November 24, 2013 - Six world powers and Iran reach an agreement over Iran's nuclear program. The deal calls on Iran to limit its nuclear activities in return for lighter sanctions.
January 12, 2014 - It is announced that Iran will begin eliminating some of its uranium stockpile on January 20.
January 20, 2014 - Iran's nuclear spokesman Behrouz Kamalvandi tells state-run news agency IRNA that Iran has started suspending high levels of uranium enrichment.
January 20, 2014 - The European Union announces that it has suspended certain sanctions against Iran for six months. The move is part of a deal in which Iran has agreed to suspend high levels of uranium enrichment.
February 20, 2014 - Following talks in Vienna, EU foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif announce that a deal on the framework for comprehensive negotiations over Tehran's nuclear program has been reached.
January 7, 2015 - The European Union announces that Iran, the United States, Britain, China, Russia, France and Germany will meet in Geneva to discuss Tehran's nuclear program on January 18, 2015.