While not exclusively Russian, the most famous collection of deep problems is heavily inspired by Russian MOs.
imo-official.org While this is the International Olympiad, the IMO compendium includes problems from the Russian Federation as the national selection tests. You can find PDF archives sorted by year and country. russian math olympiad problems and solutions pdf
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: Offers geometry-specific Olympiad problems, including the 2025 correspondence round with instructions for submitting solutions. MCCME (Moscow Center for Continuous Mathematical Education) : Provides a preliminary version of " Mathematics Via Problems While not exclusively Russian, the most famous collection
It uses the Pigeonhole Principle , a favorite tool in Russian olympiads, to solve a problem that looks intimidating but resolves elegantly. While not exclusively Russian