Van, don't forget that quite a few on this sub-forum have access to source level information on this SAM firing. I can categorically state that this was a system under Russian control.
What surprises me is the willingness of the Russian population to accept a Russian government distortion in that the Ukrainian forces, who did not face an air threat and where aircraft were friendly forces, would suddenly decide to deploy, target and fire a missile. Such logic belongs in the same bin as Russian soldiers fighting as formed units 'on holiday' and 'little green men'.