They definitely dont want Russia to have hugh stock pile of nukes that can threaten the survival of the West. Otherwise, they would already fully accepted Russia in the time of Yeltsin and Putin early days.The younger Russian population especially identifies with Western values, not Chinese. If the Russians get fed up of the war , Putin gets toppled and free elections are held, Navalny, who leans towards Western democracies, may well come to power. It may look unlikely now, but so did the collapse of the Soviet Union.
The West doesn't want to balkanize Russia. For them, a friendly regime will suffice. For America, the real strategic rival is China. Russia is just a nuisance.