A HIMARS chocking what looks like a S-300 in a non sexual way (I hate that I have to mention it, but I know the crowd around here).

It’s probably because the Ukraine have been allowed to strike into Russia with western weapons.
Maybe there have already been specific news of S-300s being blown up since then, but they are probably unable to do the job they where built to do: securing russian airspace.

PS: the S-300 has its eye on the wrong side