epa03963123 British Foreign Secretary William Hague (L), Germany’s Foreign Minister Guido Westerwelle (3-L), EU High Representative for Foreign Affairs and Security Policy Catherine Ashton (2-L), Iranian Foreign Minister Mohammad-Javad Zarif (5-L), Chinese Foreign Minister Wang Yi (4-R), US Secretary of State John Kerry (3-R), Russian Foreign Minister Sergey Lavrov (R), French Foreign Minister Laurent Fabius (2-R), are seen during a ceremony at the United Nations in Geneva, Switzerland, Sunday, November 24, 2013. Iran and six world powers reached a breakthrough agreement early on Sunday to curb Tehran’s nuclear programme in exchange for limited sanctions relief, in a first step towards resolving a dangerous decade-old standoff. EPA/MARTIAL TREZZINI