(CBS/ AP) A U.S. decision to bend policy and sit down with Iran at nuclear talks fizzled Saturday, with Tehran stonewalling Washington and five other world powers on their call for Iran to freeze uranium enrichment.
In response, the six gave Iran two weeks to respond to their demand, setting the stage for a new round of U.N. sanctions.
Iran's refusal to consider suspending enrichment was an indirect slap at the United States, which had sent Undersecretary of State William Burns to the talks in hopes the first-time American presence would encourage Tehran into making concessions.
Diplomats at the negotiating table refused to characterize the two-week time frame as an ultimatum - but it was clear the offer was a de-facto deadline for Tehran to show flexibility.
EU envoy Javier Solana said Iran still has to answer a request made on behalf of the five permanent U.N. Security Council members plus Germany to "refrain from any new nuclear activity."
"We have not gotten all the answers to the questions," Solana told reporters after apparently unsuccessful daylong talks, adding that the two weeks should allow Iran to come up with "answers that will allow us to continue."
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