There’s no evidence at all that the Putin regmine is even slightly moved by casualty numbers. Indeed - their losses may well be part of the plan - an expected and accepted trade-off. It’s not stated enough how internal ethnic cleansing of trading useless mouths for prime ukrainain lands and population is a perfectly logical conclusion. If you’re a completely depraved petromafia gangster ghoul…numbers mean nothing unless you’re talking about money and sq. km of stolen land. The numbers shock some people, but pretending the Kremlin cares is like throwing ice cubes at the sun.
Not even that. Sanctions cost Russia a lot. So ending the war would give Putin a lot more money. He might even get away with some land from Ukraine.
The real problem is that ending the war in something, which might look like a defeat is a risk. The only ideological group in Russia allowed to operate somewhat freely are nazis. However they really like the war against Ukraine. So ending it is a risk.