“It's an important step forward, but by no means the end of the process,” Amano told The Associated Press in Tehran. “There is still much work to be done.”
Western leaders, meanwhile, were keen to display a unified front after suggestions that France had broken ranks in Geneva and demanded more concessions from Iran on enrichment levels and an under-construction heavy water reactor that produced a greater amount of plutonium byproduct, which could be used in eventual weapons production.
U.S. Secretary of State John Kerry said it was Iran that put the brakes on reaching a first-phase agreement, but gave no details on the Iranian concerns and suggested it was only a matter of time before a formula is found.