Russia's not been very tolerant of religions other than Orthodox Christianity for a very long time. The former Soviet Communist government and the reigns of the Czars were even worse than the current government there.
Russian Rabbi Investigated for Distributing Book of Jewish Law [Update, more info.]
http://www.freerepublic.com/focus/f-news/1431369/posts
Russia probing whether Jewish law constitutes incitement ["first time since Stalin's regime"]
http://www.freerepublic.com/focus/f-news/1431367/posts
Russia calls for banning Judaism
http://www.freerepublic.com/focus/f-news/1431407/posts
"Russia's not been very tolerant of religions other than Orthodox Christianity for a very long time."
And this is not about Christianity. The only reason is that state can't control other religions.
Russian Orthodox Christianity is and has been the religon of Russia. They have the right to be intolerant if they wish. Their country, their rules.