Israeli air force jets fly in formation during a rehearsal for Israel's Independence Day over the president's residence in Jerusalem in this April 16, 2010 file photo. Azerbaijan, the oil-rich ex-Soviet republic on Iran's far northern border, has, say local sources with knowledge of its military policy, explored with Israel how Azeri air bases and spy drones might help Israeli jets pull off a long-range attack. REUTERS/Baz Ratner/Files
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