In order to get rid of any confusion flying about "recent" Russian planes, probably the simplest way of going about it is to think of them as:
Tu-204 = Boeing-757
IL-96 = Airbus A340 or IL-86 (plus winglets)
Tu-334 = Fokker-100 or MD-80
Russian "relatives" of Western models are more likely to first appear in Aeroflot colours. So, for example, if you spot a "baby" that in some way resembles A340, but in Aeroflot colours, then it's definitely an IL-96 (Aeroflot don't fly A340s, yet) :).
Well, that was a rather "dull" explanation but handy :). Even a starting or non- aircraft spotter should be able to distinguish the models.
Good weather to you...