> and unlike you, I don't trust my offhand estimates.
Yet you're fine with handwaving probably the biggest issue Ukraine is facing (besides the risk of losing western support/Trump winning the election and making a side-deal with Putin).
> However I will trust the Ukrainians to know,
The government probably does. Of course due to perfectly understandable reasons they will not share that information with the Ukrainian population at least until the war is over.
> while for Russia (as a country, apart from its leadership) it is very much optional
Hopefully. But underestimating the resilience of authoritarian/totalitarian regimes (compared to more free/democratic societies) isn't necessarily particularly wise. e.g. the Iran-Iraq war in the 80s was just as senseless (from the perspective of both sides) and even more bloody yet it went on for 8 years with hardly any significant dissent in either country (besides the Kurds the Iraq).
The casualties and overall cost US sustained in the Vietnam war, especially if we adjust by the duration of both conflicts were almost miniscule compared to the cost the Russian society is seemingly willing to pay.