Do you really believe that Russia grown to be the biggest country on Earth by playing nice with natives? Or if it suddenly became evil after revolution? Russia destroyed other cultures every time it got an upper hand and was built on blood of mostly other people.
No, I think they got to be the biggest country on Earth by having land that would support decent population and econonic activity next to Siberia; Canada got to be #2 by pretty much the same method, with a different stretch of marginally useful Arctic and near-Arctic land.