No one is going to war over this any more than when the USS Vincennes shot down Iran Air 655. Or Russia shot down KAL 007 or China forced the US EP-3E to the ground.
These things happen, usually as mistakes, in hostile airspace. It was an accident. The Russians / Rebels thought it was a Ukranian cargo plane and given the nature of their military radar equipment which doesn't recognize the civilian transponder signals this was a mistake.
Do the Russian use any common sense at all before they try to shoot down any civilian commercial airplanes. Really, they are so insecure that thinking any commercial Boeing 747 will serve as a spy plane. This is regard KAL 007.
Regardless, history seem to repeat itself with Russia.