Ukrainian ethnic territory, ie, the territory inhabited by Ukrainians, can be divided into (1) a compact national territory with a predominantly Ukrainian population, and (2) a mixed ethnic territory (Ukrainian-Russian, Ukrainian-Polish, and so on). From earliest times, as a result of the colonizing processes of nomadic peoples in the south and southeast, the boundaries and size of Ukrainian ethnic territory have changed substantially. In the early 13th century, during the Princely era, Ukrainian ethnic territory covered about 400,000 sq km. The Tatar invasions reduced this area to approximately 250,000 sq km and resulted in the relocation of its boundaries farther...