Ukraine can not win the war - if NATO intervenes to save face, it will start WWIII.
The Russians want Z out and at least a neutral(to NATO) leader in his place. They do not want to rule Ukraine, just keep NATO at arms length until NATO implodes all by itself. Biden’s Admin is preoccupid with keeping Iran from launching a massive ballistic missile attack on Israel which would precipitate a regional conflict that may lead to WWIII. Also China is looking for an opening to take Taiwan. The future does not look as rosey as Biden’s Admin wants to believe.