The pertinent question to me is how many modern tanks and actually trained tank crews does russia have? Certainly they have been holding back some production in a stockpiling process but is it enough? Has russia even solved the critical vulnerabilities exposed about its main battle tanks?
I think in order to domestically sell admitting defeat and backing down from attacking Ukraina, russia will have to find another target to attack and try to beat up as a distraction, what is unclear is whether it will be a competent military operation that experiences any degree of enduring success or just a pathetic distraction from an even larger pathetic failing.
Lacking equipment never hindered deranged dictators to do stupid things.
Lately, during a maneuver in Estland (IIRC), 10 Ukrainian drone operators destroyed two NATO batallions during the morning without breaking a sweat.
If this would scale up, a few dozend drone operates would be able to destroy the entire defence of the Baltics within a week or two. Putin has a time frame to attack, and it closes within the next 2-3 years. Luckily, he and the general staff of his army seem to be not aware of the drone centered battlefield.