History of Ukraine
Strikingly different interpretations of the medieval state of Kievan Rus' appear in the four schools of historiography within Ukraine: Russophile, Sovietophile, Eastern Slavic, and Ukrainophile. The Sovietophile and Russophile schools have become marginalized in independent Ukraine, with the Ukrainophile school being dominant in the early 21st century. The Ukrainophile school promotes an identity that is mutually exclusive of Russia. It has come to dominate the nation's educational system, security forces, and national symbols and monuments, although it has been dismissed as nationalist by Western historians. The East Slavic school, an eclectic compromise between Ukrainophiles and Russophilism, has a weaker ideological and symbolic base, although it is preferred by Ukraine's centrist former elites.
Ukrainian language
Some scholars see a divergence between the language of Galicia-Volhynia and the language of Novgorod-Suzdal by the 12th century, assuming that before the 12th century, the two languages were practically indistinguishable. This point of view is, however, at variance with some historical data. In fact, several East Slavic tribes, such as Polans, Drevlyans, Severians, Dulebes (that later likely became Volhynians and Buzhans), White Croats, Tiverians and Ulichs lived on the territory of today's Ukraine long before the 12th century. Notably, some Ukrainian features were recognizable in the southern dialects of Old East Slavic as far back as the language can be documented.