2months ago CovertCabal did a video counting the tanks Russia has left in storage. He came to 700 good conditioned tanks. Obviously Russia still has a lot more in service. However Oryx has Russian tank losses at 3368 tanks and the offical Ukranian estimates are at 8639 so even higher. The truth is probably somewhere between those two numbers.

However whatever it is, it shows that Russia just can not sustain those kinds of losses and they have to be more careful. Good news for Ukraine.