In 2003, Egyptian Air Force UAVs entered Israeli airspace and overflew the nuclear research facilities at Nahal Sorek and Palmachim Airbase. Israel threatened to shoot the drones down
http://en.wikipedia.org/wiki/Egypt%E2%80%93Israel_relations
http://www.mediainegypt.com/2012/07/cia-archives-egypt-israel-disturbances.html