"An agreement by Iran to send much of its nuclear fuel abroad clouded prospects for U.S.-led plans to impose further economic sanctions on Tehran over its controversial nuclear development program.

"The proposal, brokered by leaders of Brazil and Turkey during an 18-hour session in Tehran and announced late Sunday, drew a reaction of cautious skepticism from the United States and its Western allies, who questioned whether it goes far enough to address longstanding concerns over the goal of the Iranian nuclear program. Iran says its effort is for civilian energy purposes only, but Western powers believe Tehran is seeking to develop nuclear weapons."

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