I think it's important to distinguish Putin and Russia here. I don't think Russia sees Ukraine as their business.
Maybe they thought there would be a repetition of the rather clean Krim expedition.
Maybe the shadow elite are against the war.
I don't know.
This is not comparable to how one gets elected to an upper house in most countries: https://en.wikipedia.org/wiki/Federation_council_of_russia#E...
These are rubber-stamping yes-men of a single party state, obedience is the only thing required, thinking is not involved.