If you look at the Russian Law that outlines what constitutes an extremist group, then JW's fit the bill perfectly. I can see why the Russian Authorities, not having our inside knowledge about the J.W's, have decided to treat them as they would any other Extremist Group.
Perhaps the J.W's should drop their extremist views and actions,and then be more acceptable, not just in Russia, but anywhere in the World.
But of course, we know the J.W's love to be different, and love to be persecuted, it proves to them that they have the "truth", but does not prove to them the reality, that they really are Extremist.