Either way, it would seem to be unsustainable by Russia without a general mobilisation, which would be heading towards an accelerated collapse of his economy, and an increase in the likelihood of internal revolt. ......
... The intensity of this conflict is up there, well above the loss rates in most modern regional conflicts, but below the WW's & Korea.
Unsustainable in the long run for Russia in any case, no arguing there. Hopefully Ukraine is the more resilient one (and the west keeps providing the goods as long as it takes).
The actual casualties will be a mystery for the generations to come, many historians will make a good living studying this war. And that means we can only make educated guess of the current situation (I doubt even the Russians know how many they've lost) but I'm having hard time believing in the 180.