If you think it is that simple then you are missing a whole lot of points. I won't reiterate them again but you can scroll back. Plenty of debate and wrongs on both sides but this war could easily have been prevented though dialogue and could also have been shut down early through same.
People very brave with their keep fighting from behind your keyboard in Cork. If it was you loved ones being sent to the Russian meat grinded while you had the words of an American senator ringing in your ears - Russians are dying, best money we ever spent, would you maybe thing we are being used as pawns here. Would we even be in this war if not for US meddling.
Do you have any idea how many Ukrainians lives it would take to dislodge the Russians form the captured territory. What number would you say it worth it? Remember these are not just numbers, they are people.
Ukraine has some leverage now with the US war chest, time to talk. This war is on Russia's border. There will be no dislodging them.