We know that they're bringing ancient equipment out of storage, and have lost more than 10,000 vehicles, and that's only the verified losses.

https://www.oryxspioenkop.com/2022/02/attack-on-europe-docum...

Now the small amount of modern equipment they have are being shown to be in bad condition too.

If it looks like a duck, swims like a duck, and quacks like a duck, then there's really a chance that it might be a duck.

Russia has proven to be weak on the battlefield so have been forced to pivot to a war of attrition, hoping to win by sending more men into the meat grinder and using systematic war crimes, I presume in an effort to weaken the defenders' resolve.