A Russian term
City of federal subject significance is an umbrella term used to refer to a type of an administrative division of a federal subject of Russia which is equal in status to a district but is organized around a large city; occasionally with surrounding rural territories.
According to the 1993 Constitution of Russia, the administrative-territorial structure of the federal subjects is not identified as the responsibility of the federal government or as the joint responsibility of the federal government and the federal subjects.
More information on the Wikipedia page [1]