I see Russia being bogged down in a Ukraine insurgency for a very long time.
Assuming they don’t do the smart thing; declare victory and get the hell out.
The smarter thing would be if Putin suffers a mysterious stroke and is removed.
Assuming the Russian army hasn’t resorted to throwing rocks by the time this Ukraine thing gets figured out, maybe, but I’m sure the Baltic states would have their own rocks, etc. ready way ahead of time.
The Guardian talked to ordinary people in the Baltics and nearby countries about how they personally are impacted by the Russian invasion of Ukraine: