Сколько наций живет в России?
Russia is a multi-national state with over 186 ethnic groups designated as nationalities; the populations of these groups vary enormously, from millions (e.g., Russians and Tatars) to under 10,000 (e.g., Samis and Kets). 
Among the 85 subjects which constitute Russia, there are 21 national republics (meant to be home to a specific ethnic minority), 5 autonomous okrugs (usually with substantial or predominant ethnic minority) and 1 autonomous oblast.
186