I just can't see it. I really can't see how you can put Israel to go face to face with Iran. Dude, it lost to a tiny army back in 2000 and 2006, I just can't see it holding it's own for that long before it gets destroyed. Yes, it was at one point a really strong army, but even with advanced US weapons and technology, without having US troops there, I don't see Israel doing much.
It's any countries right to shoot down, control or do whatever it wishes to a spy drone, or any flying object in it's sky that's not theirs. And were the same situation to happen in any other country, no one in their right mind would return a machine used to spy on them, I don't see why it should be any different with Iran.