BRUSSELS - An offer of negotiations from Iran is "basically satisfactory" and talks with global powers on Tehran's nuclear program could start soon, Swedish Foreign Minister Carl Bildt said on Monday.

Facing sanctions that could cripple its oil exports, Iran said this month it wanted to resume the talks, frozen since January last year. But six big powers, represented by EU foreign policy chief Catherine Ashton, have yet to respond to the offer.

"We had a letter from the Iranians which was basically satisfactory," Bildt told reporters in Brussels before a meeting of European Union foreign ministers. "Now it's a question of the timing of those particular talks ... I don't know, but I don't think it's going to take too long."

A spokeswoman for Ashton said on Saturday that consultations between European governments and China, Russia and the United States were still going on to decide whether to engage Iran's approach.

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