There is a truly vast amount of Russian piano music. Some of it is easier to find than others, which sometimes colours our view of it.
Tchaikovsky, Rimsky-Korsakov, Borodin, Glinka, Cui, Catoire, Liadov, Mussorgsky, Balakirev, Bortkiewicz, Stanchinsky, Stravinsky, Prokofiev, Shostakovitch, Kapustin, Ustvolskaya, Feinberg, Shchedrin, Medtner, Rachmaninoff, Scriabin, Alexandrov....... All well worth playing among squillion of others.
To start, try Tchaikovsky's Seasons, Liadov Preludes, Shostakovich Three Fantastic Dances (in addition to other suggestions above). Then get one of the collections of Russian Piano Music available to expand your horizons.