Maybe you are being genuine so I'll try to be too, you're wrong to fear what comes next. Historically new leaders don't in totalitarian states don't want an external war, they want to secure their lot, make sure they are protected, shore up support.

Children are being kidnapped, prisoners of war ar being tortured, civilians raped, towns and cities cut off from water or flooded, left to freeze over winter. What exactly do you think is coming next? Someone with more efficiency? Less morals? Thanos?

there are but most of them left the country

Are there even russians that are not pro war?

Yes there are

It doesn't really matter if you're pro-war if you no longer have a standing army. At that point, it's just wishful thinking.

Let's see... From top of my head: Boris Nemtsov, Alexey Navalny, Ekaterina Shulman, entire Anti-Corruption Foundation and more than half of alive Russian soldiers(counting dead soldiers more than 2/3).

"This is not war of Russia and Ukraine. I an against such definition. This is Putin's war."

- Boris Nemtsov, before he was shot on bridge near Kremlin wall

P.s. funny story about soldiers. Some idiots(thank you, idiots!) from Omsk decided to open voting station near front line for governor and regional parlament. Since soldiers officially don't have internet, there was no Remote Electronic Voting(ДЭГ) and 100% voted with paper. And since paint protocols and stuff boxes is scary in front of armed men, it wasn't done at usual scale. In result hard-core pro-war United Russia governor candidate got less than 50% and I think even lost on those stations.