

In 1940, after securing the assent of Nazi Germany through the Molotov–Ribbentrop Pact, the Soviet Union pressured Romania, under threat of war, into withdrawing from Bessarabia, allowing the Red Army to annex the region.

However, the legality of these acts was disputed, most prominently by the Soviet Union, which regarded the area as a territory occupied by Romania.

Soon after, the parliamentary assembly declared independence, and then union with the Kingdom of Romania. Bolshevik agitation in late 1917 and early 1918 resulted in the intervention of the Romanian Army, ostensibly to pacify the region. In 1917, in the wake of the Russian Revolution, the area constituted itself as the Moldavian Democratic Republic, an autonomous republic part of a proposed federative Russian state. Following the Crimean War, in 1856, the southern areas of Bessarabia were returned to Moldavian rule Russian rule was restored over the whole of the region in 1878, when Romania, the result of Moldavia's union with Wallachia, was pressured into exchanging those territories for the Dobruja. The newly acquired territories were organised as the Governorate of Bessarabia, adopting a name previously used for the southern plains between the Dniester and the Danube rivers. The acquisition was among the Empire's last territorial acquisitions in Europe. In the aftermath of the Russo-Turkish War (1806–1812), and the ensuing Peace of Bucharest, the eastern parts of the Principality of Moldavia, an Ottoman vassal, along with some areas formerly under direct Ottoman rule, were ceded to Imperial Russia. About two thirds of Bessarabia lies within modern-day Moldova, with the Ukrainian Budjak region covering the southern coastal region and part of the Ukrainian Chernivtsi Oblast covering a small area in the north. Map of Bessarabia from Charles Upson Clark's 1927 book Bessarabia, Russia and Roumania on the Black Seaīessarabia ( / ˌ b ɛ s ə ˈ r eɪ b i ə/ Gagauz: Besarabiya Romanian: Basarabia Russian: Бессарабия, Bessarabiya Turkish: Besarabya Ukrainian: Бессара́бія, Bessarabiya Bulgarian: Бесарабия, Besarabiya) is a historical region in Eastern Europe, bounded by the Dniester river on the east and the Prut river on the west.
