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Iranian Foreign Minister Mohammad Javad Zarif urged global powers Wednesday to "seize" the moment to reach what could be a historic deal to cut back Iran's nuclear programme. "Iran has shown its readiness to engage with dignity and it's time for our negotiating partners to seize the moment and use this opportunity which may not be repeated," Zarif said, after meeting alone with US Secretary of State John Kerry. The US, Russia, China, Britain, France and Germany want Iran to scale down its nuclear programme to extend the "breakout" time needed for the Islamic republic to assemble enough nuclear material to make a bomb. Iran denies wanting the bomb and its negotiators are under strict orders from supreme leader Ayatollah Ali Khamenei to refuse any curtailing of its programme without sanctions relief.