The territorial configuration of Soviet Ukraine underwent significant evolution during the interwar period, establishing boundaries that would shape the republic's identity for decades. Following the tumultuous years of civil war, the Ukrainian Soviet Socialist Republic emerged in March 1919 with borders that reflected both revolutionary aspirations and geopolitical realities.
The initial Soviet Ukrainian territory was considerably smaller than historical Ukrainian ethnographic lands. Significant Ukrainian-populated regions remained outside the republic's boundaries, generating persistent territorial disputes with neighboring Soviet republics. In the north, the Starodub area, with its substantial Ukrainian population, was incorporated into the Byelorussian SSR, while to the east, the historically Ukrainian regions of Slobozhanshchyna and the industrial Donbass were initially administered by the Russian SFSR. These eastern territories, crucial for their economic resources and Ukrainian demographic presence, were gradually transferred to Soviet Ukraine during the 1920s, particularly following administrative reforms that recognized ethnic and economic considerations.
The western frontier of Soviet Ukraine represented not merely a republican boundary but the international border of the entire Soviet Union. Beyond this limit lay territories with significant Ukrainian populations, notably the Volhynia area within interwar Poland, which remained a point of contention and nationalist aspiration throughout the period.
The republic's territorial expansion included innovative administrative experiments. In 1924, Soviet authorities established the Moldavian Autonomous Soviet Socialist Republic along the Dniester River, ostensibly for the indigenous Romanian-speaking population but strategically positioned as a forward base for potential expansion into Romanian-held Bessarabia. Similarly, the Crimean Autonomous Soviet Socialist Republic was created within Soviet Russia in 1921, though its demographic composition was ethnically diverse, with Russians, Tatars, and Ukrainians sharing the peninsula.
Kharkiv (Kharkov) served as the Ukrainian capital from 1919 to 1934, symbolizing the republic's eastern industrial orientation and representing a departure from the traditional cultural center of Kyiv. This choice reflected both practical considerations—Kharkiv's proximity to the Donbass industrial region—and ideological ones, as the city was perceived as more proletarian and politically reliable than historically bourgeois Kyiv. The capital's transfer to Kyiv in 1934 marked a shift in Soviet Ukrainian policy.
The transformation reached its culmination in August 1939, when the Molotov-Ribbentrop Pact enabled Soviet territorial expansion. The subsequent annexation of eastern Poland brought Western Ukraine, including Volhynia, into the Soviet fold, finally uniting Ukrainian lands that had been divided since the Polish-Soviet War. This territorial expansion fundamentally altered Soviet Ukraine's demographic, cultural, and political landscape, creating the approximate boundaries that would define the republic through the Soviet period.
