I mean Russians are murdering Ukranians right now.
So the least Russians opposed to it could do is protest even under threat of arrest. Protests already are happening in Russian cities so it is possible.
You are not following Belarus or Russia close enough to know that protests are going on non stop for pretty much a decade for little to no avail. Your view is understandable (I used to be likewise naive), but it does not have much connection to reality.
