Wacky fact for you: Russia is a good source of weird, dystopian sci-fi fiction to turn into videogames. First off, S.T.A.L.K.E.R.: Shadow of Chernobyl is loosely based on a Russian novel which itself begat a movie adaptation also called Stalker. Well, that's similar to what is happening with Metro 2033, which is based on a different bleak/post-apocalyptic Russian novel; in fact, some of the fellows who worked on S.T.A.L.K.E.R. are now at Metro 2033's development studio, 4A Games.