Well, for one it's a dictatorship now and whatever Putin thinks will become law. Quite a long explanation about it, so I suggest you look at this site and see how they think about it. Remember that Putin is ex-KGB and always had strict laws with little freedom. Check this out as it's really interesting and answers your question! Russia's Anti-Gay Law, Spelled Out in Plain English - Mic
mic.com/articles/58649/russia-s-anti-gay-law-spelled-out-in-plain-englis