Thank you for tagging me, but I haven't been following the war in the Ukraine as closely as many others.
I will offer a few general points, if you'll allow me. One of the biggest problems I've noticed through the years from being an observer during tactical evaluations in Europe, is the lack of a strong NCO corps in European Armies. They're all Officer driven and NCOs have very little authority, vs the American Army. That means orders take more time to be enforced on the battlefield, which can lead to potential gains never realized. More over, during intense combat, as an NCO, especially a Senior NCO, I could take charge and lead troops to seize and important initiative, without having to wait for orders from above. European Armies can't do this. Their NCOs wait back on their heels until their officers issue orders. This often leads to missed opportunities. There are a lot of former American Special Operation Soldiers in the Ukraine (we were all NCOs in SOC) so that may give an advantage to the Ukraine.
Secondly, there's the issue of moral, which can't be overstated in warfare. Yeah, every Soldier is trying to stay alive, but how much risk he's willing to take to accomplish the mission comes down to training and moral. I was an observer during tactical evaluations of both Dutch and Danish forces, during my time in Europe, and most of the lower enlisted Soldiers (including some of the junior NCOs) just didn't give a shit. They were conscripts who were waiting their enlistments out and weren't particularly well paid, well fed or cared for. Take this over to the Ukraine war, and assuming the training is similar between the Russian and Ukrainian Soldiers, the Ukraine holds a huge moral superiority. Why? Because they're defending their homeland and their families. They simply have more to fight for than their Russian counterparts.
Finally, there's the tactics of offense vs defense in warfare. If the two sides are fairly evenly matched (and they seem to be, with Russia having a small advantage) it's much less costly in terms of blood and treasure, to play defense than it is to play offense. Russia started out on the offensive and may have burned itself out in terms of men, equipment and moral. They cost themselves the initiative and now the Ukrainians, who have, for the most part held most of their ground, are counter attacking.
To wind this up, I spent over 20 years in the Army and I'd be more comfortable fighting as a Ukrainian right now than a Russian.