On social media there have been reports going back at least as far as July that the S300 has been used as a ground attack system or in a ground attack role. And that makes some sense, or at the very least it should not be a surprising capability. Assuming the S300 has either a helo mode or a manual forced launch mode, it should be possible to use those modes to launch on a fixed location.
It also has to be remembered that the S300 is a family of missiles and systems, not just one specific missile type. The S300P, S300PT, S300PS, S300PM, S300PMU, S300PMU1, and S300PMU2 (and how many others I may have missed) are all S300's, but of different ages and capabilities. And that does not even start to go into the S300V stuff (S300V is a different line, which also carries the "S300" designation).
Talking about Russian missiles can get confusing to the unfamiliar. The same missile or missile system can have multiple names or designations it is known by. The terms V500, S300Px, 5V55, and SA-10 may all be used to describe the same missile. And then you get into the variations of each missile, do we mean the 5V55K or the 5V55R? The S300PT or the S300PS?
The point I am trying to make (and thus far failing) is that there are a lot of different "S300" missile types. Some are essentially obsolete, if not in performance than in the fact it has been replaced by something else. The Russians might be using up the oldest first, getting rid of missiles they no longer consider to be first rate, to do a needed task. For example, the original 5V55K or 5V55KD was command guided (
Almaz S-300P/PT/PS/PMU/PMU1/PMU2 / Almaz-Antey S-400 Triumf / SA-10/20/21 Grumble / Gargoyle ) and would have had a much more limited range against maneuvering targets. But, against a non-maneuvering target, or a fixed target, you could push the range out to closer to the kinematics of the missile and still have a high probability of success.
It would tell a lot more about Russian issues / intent if we could get more detail on what is being done, i.e. are they just shooting up old original missiles to get them out of the inventory (most missiles have a limited shelf life, missile grain issues and such, they might even be using expired missiles), or are they shooting 48N6's that might indicate they are dipping into newer inventory in desperation? But we, at this level, are not likely to get that kind of information.
T!