[Imp]

Not been following heavily but the most obvious thing to take from this is stop always using the best equipment available. I wonder if Russia just expected the Ukraine to capitulate when faced with such a massive force. For the first few days they played nice limiting collateral damage I think that changed when they realised it was not going to be quick as expected.

The big problem is while there is a lot of coverage its cherry picked & biased. The question is who are we watching in action I believe a lot of troops were pulled from the Eastern Military District. My guess as they are facing China probably worse trained & equipment that is not upgraded. As said not following but a lot of vehicles do not seem to have Arena for example.
Is this really a surprise your not talking outfitting a few hundred or at most a few thousand tanks.
Slightly surprising is the level of incompetence shown but we generally only see the success stories. As mentioned elsewhere editing is a wonderful thing to.