Show us one concrete example of Russia successfully going against or curtailing Iranian interests in Syria. If the above claim were true, then surely Moscow would have prevented Iran from stationing Resistance forces along the entire region bordering Occupied Golan, at least prior to the war in Ukraine when Russia's ties to Tel Aviv weren't nearly as strained as they tend to be now. As a matter of fact during the sole credibly reported instance of the Russian military attempting to reassign a position to Hezbollah units and have them move away from a location close to the zionist entity, Hezbollah proceeded with a show of force which dissuaded the Russians. Moscow would let go of such ideas after the episode and come to terms with permanent presence of Iranian-led forces in the sector.
Here's a map of (pro-)Iranian military posts across Syria published by the Atlantic Council, a USA think tank in 2020:
I wonder if this is what Russia running the show all on its own is supposed to look like? Counted 21 plus 14 equals 35 locations of either direct Iranian / pro-Iranian military presence or control. To which 7 border crossings would have to be added, read 42 sites in total.
The paper this map is taken from includes some other interesting charts.
Leaving aside the obligatory anti-Iranian slant of the article, which seems to be depicting Iran as some expansionist foreign party when in reality Iran is engaging in partnerships on equal footing with Damascus, it does mention a whole series of bilateral fields of cooperation (again if you can look past the biased semantics).
https://www.atlanticcouncil.org/blogs/menasource/factbox-iranian-influence-and-presence-in-syria/
According to this study there's literally not a single geographical zone other than Tartus and Latakia, nor any area of activity where Iranian presence would have diminished since 2013.
So not only has Iran never been sidelined from Syria but the opposite is very much the case.
@AA_