I'm sure this kind of concerns is one of the prime reasons that seems to "slow down" the support. I don't want to whitewash anyone, but I'll give credit when credit is due - the officials in the western(-oriented) countries do realize that they're a temporary asset in their position, with a goal to contribute to the society that enables their entire lifestyle. While some may not be a proper fit for the position of such power, today many, if not everyone, realize that they're going to have to step down sooner rather than later, and if they want to enjoy the benefits, they better make the electorate happy - today, this surely includes making sure that none of the electorate has to go die because Putin wanted some landgrab out of some pissy revenge and power-hunger.

We all want this war to end as soon as possible. Even Putin wants to, undoubtedly, but he's too stupid and arrogant to withdraw and admit he made a mistake.