Russia and other countries shared or sold to those countries.
U.S. government officials confirmed on December 6 in Iran found a UAV RQ-170 under the U.S. Central Intelligence Agency . CBS 7 website quoted American experts and officials as saying that UAVs are often used to perform the U.S. military and CIA covert surveillance and intelligence gathering , not self-destruct system assembly .
The report also said this Iran said the capture of the United States has not been any damage to the UAV . But the United States is more concerned that Iran may be harvested from UAVs things with China, Russia and other countries shared or sold to those countries.