Nobody has any reason to. Ukraine has made their biggest gains since the beginning of the war. Russia controls vast regions of land under no real threat, while Ukraine is facing a crippling energy crisis going into winter. And the US is weakening a geopolitical adversary and has been granted a defacto right to give the military industrial complex a blank check - something the political establishment has been longing for, for decades.

So I don't think anybody is anywhere near ready to concede. It's certainly going much worse for Russia than they expected, but being where we're at today is also far from what the US had in mind 9 months ago when this all started. It seems the most likely outcome for this war is a long, bloody, and expensive affair. The real issue is the specter of WW3 in the backdrop. There's an argument to be made that Zelensky sees that as a win condition (as per the topic of this thread), but fortunately it seems that neither the US nor Russia do. And they are the ones that get to decide if/when that happens.