Well, it depends on how it ends. If Russian society mobilizes to stop this war, it would be hard to do it by making Putin give up on this war. The more likely scenario—which is early to be predicting, for sure—is that if the Russian people manage to stop this war, it will be through Putin's replacement by elites, somehow, who are not willing to go that far and bear the costs of these sanctions, or by some kind of popular mobilization that, again, forces the hands of elites to replace Putin with someone else.
If that happens, then the Iron Curtain's falling is averted, but we do not see that yet. Yes, we see some mobilization in Russia, but keep in mind that Putin has consolidated a very repressive regime over the last 10 years. He has been in power for 22 years, but it's in the last 10 years that he has really consolidated a repressive authoritarian regime. In that regime, it is very hard to protest. Russian people may be brave, but they may not be that brave.