In a conventional war, yes (it would be short, although perhaps not as short as some might think, as the Russians, despite their firepower, aren’t really very good.)
In an unconventional war, if the Ukrainians are willing to accept high casualties*, and if someone supplies arms to the Ukrainians, the Russians will wish Putin had stayed home.
Ukraine is a country that was basically totally razed, and had ~19% of its population killed, in WW2, and for this they got Round II of subjugation a la Stalin. Now, under 1% would get them independence for most of the existing territory for the forseeable future. (And, probably, a tough generation of recovery.) The question is, do they have the will?