It's only taken them a few days though. The fact that RU hasn't taken any new territory in months and UA has just started retaking it suggests the Russians are wearing out and UA is getting stronger.

RU economy is also being hammered by Western sanctions. They don't appear to be getting much help, whereas UA is getting loads of it. There doesn't seem to be any positive endgame for Putin in this unless something dramatic happens or the West loses its nerve; the most likely outcome now might be that he gets taken out by his own people.