Iran announced in December 2011 that they had
successfully captured the RQ-170 U.S. spy drone that had invaded their
airspace. It seems they have been playing with it ever since and have
now succeeded in making a clone.
While the U.S. thought it had crashed, the Iranian military had apparently hacked the drone's control system and brought it down safely.
Some
time ago, Iran made a copy of the clone as a simple toy and sent it to
the U.S. in a joking response to demands to hand over the aircraft.