First of all, I don’t think “Finlandization” is desired by the Ukrainians, so what we or the Russians may want may not matter that much in the end.
As far as what Ukrainians want, I think we get different answers from different Ukrainians, but at a minimum I think most want political independence neither shackled to Russian interests nor overly dependent on “the west”. I Ukraine politics that was neutral on cultural interests would leave cultural interests to independent individual decisions made in the Liberty of the people’s lives. Some would keep strong ties to Russian “culture” while others would renew or make ties with countries in the EU. It does not have to pull the nation apart politically unless political factions don’t want the people to have that cultural freedom in their lives.
Finlandization was also always a fiction. Finland is part of the EU. Even if it is not written down, there is no chance that the NATO wouldn’t intervene if Russia sent troops into Finland.