Looks like the S-400 is some serious hardware.
Debka has already published a story linking Russia to the air defense system used to take down the Israeli jet.
I believe s200. Also the plane wasn’t shot down but abandoned. Then targeted by multiple long range SAMs like s200/300/400 it is better strategy to eject than trying to evade them. These are pretty much capable to overcome countermeasures and the payload aren’t manpads. You’d get blasted to tiny pieces upon hit.
Would not be surprised that Russian techs were actually firing the missiles at the Israeli jet.