Keep in mind that just because the aircraft was found at 8.4nm out doesn't mean that is where it was when it got hit. However, since the pilots didn't report any problems or incoming and did not eject, the possibility of them getting hit and trying to control the plane in radio silence and riding it all the way down (and into Syrian airspace) and not ejecting seems quite far off. We'll know more details (or at least some things that someone wants John Q. Public to know) once the larger parts of the wreckage are brought up off the sea floor.