There a way, unfortunately. Putin: 1. has no regard for human lives (including lives of Russian citizens) 2. is great admirer of Joseph Stalin.
His current plan likely: 1. destroy Ukrainian military and establish control over all major cities, roads and borders (russian losses to achieve this goal is no-brainier for him) 2. starve population (repeat Holodomor [1]) 3. sent millions to prison camps.