Ukraine

This is going to be controversial but there were slight benefits that have been gained by Russia by this war, they basically identified all the areas in the military that were corrupt and lazy, remember in the beginning how unprepared the Russian forces were, they have basically fully transitioned into full war manufacturing, they now have the most experience fighting force in the latest modern war next to Ukraine. They also have basically almost empty prisons, almost every poor desperate persons would have taken the huge pay day and maybe also ended up dead, so a lot of societal "undesirables" were eliminated. Also basically any opponents of Putin could be eliminated by basically blaming Ukraine or blaming the individual for being a secret Ukrainian supporter or against the state