Nothing, and why aren’t the Israelis blowing these planes out of the skies?
Why do the Israelis have to do our job for us? With our 'stealth' aircraft that most other countries in the world cannot see on radar, why can't we do it (and then deny all knowledge)?
Oh, sure, there would be self-righteous claims that we did it but with no proof, it would be just like all the claims that the United States has captured Alien Spacecraft. Easy to claim but hard to prove...