Killings won’t go any higher after a peace treaty than they would without one. Either the war goes on and Russians keep killing civilians in occupied territory, or Russians keep killing civilians in conquered territory. I’d even water that killings of civilians would decrease if the war ended.
Option 1: keep fighting a war your losing, thus losing more soldiers, weapons, supplies, and civilians. Option 2: accept your losses and live to fight again another day.
Crazy, because all of those countries have an awful history of human rights violations that was only stopped when they were forced to at gun point. Many of those countries have had recent human rights violations too. You’ve picked countries that’re currently struggling with racist and sexist tendencies actually. You should read some UN human rights violation reports before you make stupid claims.