Not being for the Russian ban is not the same as supporting the religion. In fact, a ban in Russia is a win/win for Watchtower.
The best method of counteracting cults such as Watchtower is not banning, but as was said regulate, tax, fine the organization. Not putting the rank and file people in jail simply for going to meetings, door knocking, ect... If any individual is guilty of actual criminal acts, that individual should go to jail, of course.