Apart from the other points that have been raised: basically every recent report about Ukrainian troops has gotten a bit in it along the lines of “they’re exhausted and have taken heavy losses, but are in good spirits and willing to fight on”.

Especially if you read what individual soldiers are saying, I get the feeling that this war would not end, even if support to Ukraine where to vanish completely (good luck convincing Poland, the Baltics and Nordics). You’d just get Afghanistan, but the invaders are openly genocidal and don’t give a fuck about civilians at the best of times.

Or get chased around by explosive FPV drones and Ali-express quadcopters dropping grenades.

And that’s before someone with more resources than Ukraine inevitably makes an airplane load of these things that just automatically go for anything vaguely human shaped.