When Slavic tribes moved into Russia around the 10th century, Russian folk dance became very popular. These dances were and still are a main event at any holiday, celebration or gathering. The dancers wear elaborate costumes, always with the color red incorporated as the Russians associate this color with beauty. Women wear headdresses and elaborately embroidered tops or dresses depending on the region. Men wear similar outfits with high boots. These dances were developed overtime due to the huge populations of non-ethnic Russians contributing to the country's culture.
I have attached a video of a traditional Russian folk dance.