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semi-mythical ones from pre-Christian and early Christian times. Their original language is old slavic and even though they are readable for modern Russians, they are not easy reading. Usually are not written by one author.
Folk-lore. Mostly fairy tales.
Classical Literature. Written in the 19th (or early 20th) century. Surprising enough, there are no well-known authors from before the Classical Age. These books are school standards, and thus hated by the young.
Soviet Sci-Fi. It is mostly hard sci-fi, where Earth is often depicted as having a post-scarcity communistic society, but often depicts flaws of the USSR government.
Post-USSR contemporary literature.
Criminal thriller of different sorts.
Contemporary sci-fi and fantasy. Ranges from very hard sci-fi to high fantasy and varies in quality.
Humorous fiction is sci-fi/fantasy with emphasis on comedy.
The term "Russian novel" is often shorthand for "lengthy and turgid". While War and Peace probably created this cliche, it's less true than many think.