Russia wants access to some of the best farmland in the former USSR, mineral resources and the strategic benefit of unfettered access to the Black Sea and the Mediterranean? It's a war for resources Russia doesn't have and Putin thinks it needs, and a target for the Russian population to distract them from how shit things are.

Populists and authoritarians are supported by those at the bottom of the pile with little to lose. Russia's actions are very much related to food and housing and education and jobs.