There is at least one issue here. Putin doesn't have the economy to reconstitute the old soviet union.Putin doesn't want peace until he can reconstitute the old Soviet Union. He wants to go down in Russian history as a great Russian leader.
The lions share of what they have is in its military. They have been in the Ukraine for the past 3+ years and have
expended a huge amount in that conflict. They are already relying on other countries for some support.
Not sure if he's willing to engage in an all out WW, or not.