Russia is one of the countries occupying the Europe and Asia continents that was part of the United Soviet Socialist Republics. It is currently the largest nation in the world.
The Smurfs have once arrive there by the time crystals in the Season 9 episode "Painter's Egg-Cellent Adventure". During the episode, Painter meets an Easter egg "painter" and his magic hen which lays Easter eggs for the gifts to Tsar. An evil wizard casts a spell on the hen which makes it cannot lay Easter eggs anymore. The Smurfs help the painter to reverse his hen to normal again.