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Iran's president says his country is open to talks with world powers about its nuclear program and will respond soon to the EU Union about the possibility of more dialogue.

President Mahmoud Ahmadinejad, visiting Istanbul for a U.N. conference, said Monday that the willingness of European Union foreign policy chief Catherine Ashton to return to negotiations is a sign that dialogue had not failed.

A round of talks in Istanbul in January collapsed after Iran said it would not freeze uranium enrichment. At that time, Ashton said no new talks were planned but that world powers remained open to more discussions.

The U.S. and its allies suspect Iran of seeking to develop nuclear weapons. Iran, which is targeted by U.N. sanctions, says its program is peaceful.