I call BS
Unless Russian passenger aircraft routinely carry missile detection systems.
I am highly skeptical of anything coming out of DEBKA, but it’s my understanding that missle targetting detection equipment is more or less standard equipment now on civilian jumbo jets.
Pretty safe bet = yes they do...
But if the Syrians can't lock & hit this russki pax transport...
I doubt any modern carrier-based assets will have any trouble gaining air dominance--real quick and in a hurry.
Would you believe a second source?