In the Italian incident, and both Ukraine incidents, the aircraft were shot down by anti-aircraft missiles. As already mentioned, Scud is a ballistic missile that can't target aircraft, probably not even overhead, certainly not 800km away.
If the combatants in Syria start firing Scuds down the Med we've got more problems than just aviation.
Last edited by OldLurker; 14th Oct 2015 at 17:48.
Reason: Clarify