Russian Federation is a dual-national state with over 185 ethnic groups designated as nationalities, population of these groups varying enormously, from millions in case of e.g. Russians and Tatars to under ten thousand in the case of Samis and Kets. Among 85 subjects which constitute the Russian Federation, 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 an autonomous oblast.