There are no grown-ups at the kids' table. Why are they competing over territory? Russia wants control. Ukraine wants independence. The people who want to live there want jobs and security. Russia originally wanted a promise of neutrality.

Why is there a fight over who owns things when there should be cooperation over improving places?

The children are arguing over whose toys are whose, and there's no adult around to make them do their chores.

This is Capitalism's purpose: to turn everyone into a selfish child. Putin has already lost that part, so he might as well find a corporate lawyer to write everything up as a limited liability corporation and negotiate the profit sharing with Ukraine.