Lolita is... complicated, and also not Russian. Nabokov was of Russian origin, but emigrated from Russia in the interwar period (when he was in his early 20s) and lived the rest of his life in western Europe and the US. Lolita in particular was written in 1955, a few years before he left the US for Switzerland.

And, yes, it includes pedophilic imagery and themes. It's not particularly graphic in the sense that a reader of erotic literature might expect, but obviously still not for the squeamish given the subject matter. With that warning out of the way, it's well worth a read, though obviously it makes for difficult material.