Off the top of my head, I can only think of a few Russian players that have played outside of Russia: Arshavin and Pogrebnyak and Palvlyuchenko. I don't think any of them really qualify as flops. Arshavin was good for Arsenal early on but decided to stop putting any effort into the game. The two strikers have both been decent, although Pogrebnyak didn't score many goals for Stuttgart. I also forgot Zhirkov who was injured quite often at Chelsea. They obviously are not world beaters, but taking a chance on Dzagoev on a free transfer makes more sense than spending millions on a player from Argentina B. He is 21, has caps for Russia, played in the champions league, and he is one of the most talented players in Russia.