If they are expecting ISP to distinguish https traffic from encrypted traffic then I am not sure how they can implement this. They can ban russian VPN, but people can purchase VPN outside of russia and the connection will be encrypted. Someone could purchase a vps or server and then run an encrypted tunnel or setup their own vpn. Nearly all large business use a form of VPN. Seems like a stupid rule and basically a way for the Russian government to clamp down on internet freedom. They fear the internet will lead to a power shift, they pretend that it is about security. The western government use the same excuse.