European Union foreign policy chief Javier Solana told the European Parliament on Wednesday that the Iranians had made "no commitment to suspend" enrichment.
The dialogue with the Iranians "cannot last forever" and it was up to Tehran "to decide whether its time has come to end," he said.
Solana said his talks had found "common ground" on some issues "but we have not agreed in what is the key point, which is the question of suspension of activities before the start of the negotiations."
He suggested that if the talks ended, the standoff should be moved to the Security Council.
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