(L-R) Germany's Foreign Minister Guido Westerwelle, British Foreign Secretary William Hague, Chinese Foreign Minister Wang Yi, U.S. Secretary of State John Kerry, French Foreign Minister Laurent Fabius, Russia's Foreign Minister Sergei Lavrov, EU foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif gather at the United Nations Palais in Geneva November 24, 2013 File photo. REUTERS/Carolyn Kaster/Pool
UNITED NATIONS (Reuters) - Negotiations between Iran and six world powers on implementing a landmark November deal to freeze parts of Tehran's nuclear program in exchange for easing some sanctions have run into problems over advanced centrifuge research, diplomats said.
The dispute over centrifuges highlighted the huge challenges facing Iran and the six powers in negotiating the precise terms of the November 24 interim agreement. If they succeed, they plan to start talks on a long-term deal to resolve a more than decade-long dispute over Tehran's nuclear ambitions.
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