Access to many viewpoints and sources of information does not mean much, as we see here in the U.S. The idea that we just need to shower Russia with the "right" information to get them to turn against Putin is simply a fantasy. However, it's still worth doing as it will help some.
I don't expect plain rhetoric to change the minds of Putin supporters.
Unfortunately, we have to resort to economic pain, which is quite grim even if it's not having your leg blown off and your home reduced to rubble: businesses ruined, working class populations impoverished, massive uncertainty...
It's also not guaranteed to work, as aggressors and oppressors are adept at wallowing in self-pity and inventing victimization narratives.
What's changed for me is that I've come to believe that the Russian population is a bit more at fault here for buying Putin's bullshit.