Iran's semi-official Fars news agency says Russia and Chinahave asked Tehran to provide them with information on a U.S. ­drone captured bythe Islamic Republic in December.

The report, released on Thursday, quotes Ahmad Karimpour, an adviser to Iran's defenseminister, as saying Tehran has received requests for many countries forinformation on the RQ-170 Sentinel, but Moscow and Beijing have been mostaggressive in their pursuit of details on the drone. He did not elaborate.

Iran said in December that it had downed the unmanned stealth aircraft ineastern Iran.

U.S.­ officials have acknowledged losing the drone. They have said Iran willfind it hard to exploit any data and technology aboard it because of measurestaken to limit the intelligence value of drones operating over hostileterritory.