The propaganda here is a bit thick. The Russian version is that half the incoming Israeli missiles were shot down.
Keep in mind Syria was using the S-200 system, an older less advanced system, not the system that Turkey wants anyway.
Russia has two more advanced air defense systems the S-300 and S-400.
“Russia has two more advanced air defense systems the S-300 and S-400”
And Israel is worried Syria will get the S-300s much less the S-400s.