TEHRAN - Iran will unveil a new advance in its nuclear program in the coming months, the head of its Atomic Energy Organization was quoted as saying on Saturday, in comments that showed defiance in the face of new U.N. sanctions.

"In the next few months Iran will announce a new nuclear achievement in connection to the production of fuel for its Tehran research reactor," Ali Akbar Salehi was quoted as saying in the Resalat daily. He gave no details.