US Secretary of State John Kerry met with Iranian Foreign Minister Mohammad Javad Zarif for more than an hour on Friday to discuss developments in nuclear negotiations between Tehran and major world powers, which have been at an impasse for months."Their meeting was focused on the ongoing nuclear negotiations and they discussed the recent meetings of the P5+1 (six world powers)," a senior US State Department official said on condition of anonymity."Secretary Kerry also reiterated our desire to move toward a political framework by the end of March," the official added. "They agreed to stay in close touch and that they would try to meet again soon."The meeting, which included senior European Union official Helga Schmid, took place on the sidelines of the annual Munich Security Conference. Kerry and Zarif have met repeatedly in recent months in an attempt to break the deadlock in the nuclear negotiations.