the U.S. would continue to pump Ukraine full of weapons
This actually seems like a ceasefire agreement that Russia might agree to?
The whole point of the SMO was to stop and undo the militarization of Ukraine by NATO. Allowing Ukraine to rearm would defeat the entire purpose. I won't pretend to know what the Kremlin is thinking and whether or not they will after all end up conceding on this, but at least in all their public statements they continually repeat that the goals remain unchanged - demilitarization, de-nazification and no NATO - and all the goals will be achieved. The West still thinks that Russia isn't serious about any of those points. Time will tell.
Russia has probably written off all the assets the Europeans stole from them. I don't think they're ever getting those back regardless how the war ends, but it doesn't matter because they can seize western assets in Russia and more than make up for their losses. They have already partially begun doing this.