Polonska-Vasylenko was a specialist in Ukrainian archeology, the history of
Kyivan Rus', the later history of the
Zaporozhian Cossacks, and the history of her own times. She also wrote extensively on modern Ukrainian historiography. Before the
First World War, she participated in the compilation and writing of a large Russian cultural history atlas which was published in three volumes between 1913 and 1914. During the 1920s, she published extensively in the various periodicals of the Ukrainian Academy on the Zaporozhian Cossacks and the transformation and absorption of southern Ukraine into the Russian Empire during the reigns of Catherine the Great and her predecessors. During the Cold War, deprived of the use of the archives of her native land, Polonska-Vasylenko collected and reprinted many of her earlier studies on
Zaporozhia (1965–67), wrote several memoirs of intellectual life in revolutionary and Soviet
Ukraine including a history of the Ukrainian Academy of Sciences (2 vols. 1955–1958), published a book on the Stalin repressions of Ukrainian historians (1962), and turned increasingly toward synthesis, at the end of her career, publishing a volume on Ukrainian historiography (1971), and a two volume general history of Ukraine (1973–1976). In her general approach to Ukrainian history, Polonska-Vasylenko followed the lead of her distinguished émigré predecessor,
Dmytro Doroshenko, and wrote in a conservative vain, stressing the importance of the
Cossack officer class and the Ukrainian gentry into which they were later transformed. She saw the strivings of this class for national unity and independence, or, at least, autonomy, as one of the main currents of Ukrainian history, and she characterized the nineteenth century as a time of Russian and Austrian occupation. She ended her general history with the advent of Soviet rule. ==Legacy==