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How long were Russia involved in Syria, Afghanistan?
I don't think its possible to pick two more different conflicts to compare to, but you make a reasonable point. That said, Russia didn't do much in terms of infantry and mechanised infantry in Syria...they scaled that side of things down quite early on (2016 I think) and switched approach to private armies (mostly Wagner) with air support. I reckon the Russian troops with the most combat experience would have gained their experience in Georgia, Chechnya and Ukraine itself.
Edit: I'm not sure that Russia ever had more than 5,000 non support staff in Syria.
It's only been couple of days. How long were Russia involved in Syria, Afghanistan?
How battle-hardened are the Ukraine troops? Give it a couple of months, and a lot more deaths, and see how morale is.