Is the Russian opposition making a dent in Putin's regime?

"To confront this regime is, I think, a duty of any reasonable person," says Vladimir Ashurkov, a Russian opposition activist living in exile and an associate of Putin's best-known critic, now jailed, Alexei Navalny.
But their organisation, the Anti-Corruption Foundation – banned by Moscow as an "extremist" group – has been clear that the Russian people are not going to overthrow Putin.
So, can Ashurkov and his allies justify the risks they are asking people to take to resist in Russia?