They are definitely going to just install a puppet regime. They are being very careful to not destroy public infrastructure or harm civilians. People in Ukraine still have food, water, electricity, Internet, etc. There are videos of people in Ukraine just casually going about their business still as the media claims "fighting is raging" all around them.
This whole deal is more of a Ukrainian civil conflict with Russia intervening to prop up their side. I expect a political resolution soon; a deal for Zelensky and his cronies is being worked in the background.
The idea that the Ukrainians are rising up in a notable way or this is some brutal destruction campaign by Russia doesn't seem to be true.
That still doesn't make it right, but it further emphasizes why this is not our fight.