In 1940, after securing the assent of Nazi Germany through the Molotov–Ribbentrop Pact, the Soviet Union pressured Romania, under threat of war,Joseph Rothschild, East-Central Europe between the two World Wars University of Washington Press, Seattle, 1977; , p.314 into withdrawing from Bessarabia, allowing the Red Army to enter and the Soviet Union to annex the region. The area was formally integrated into the Soviet Union: the core joined parts of the Moldavian Autonomous Soviet Socialist Republic to form the Moldavian Soviet Socialist Republic,Henceforth, references to "Soviet Socialist Republic" are abbreviated "SSR" while territories in the north and the south of Bessarabia were transferred to the Ukrainian SSR. Axis-aligned Romania recaptured the region in 1941 with the success of Operation München during the Nazi invasion of the Soviet Union, but lost it in 1944 as the tide of war turned. In 1947, the Soviet-Romanian border along the Prut was internationally recognised by the Treaty of Paris that formally ended hostilities of World War II.
In 1940, after securing the assent of Nazi Germany through the Molotov–Ribbentrop Pact, the Soviet Union pressured Romania, under threat of war,Joseph Rothschild, East-Central Europe between the two World Wars University of Washington Press, Seattle, 1977; , p.314 into withdrawing from Bessarabia, allowing the Red Army to enter and the Soviet Union to annex the region. The area was formally integrated into the Soviet Union: the core joined parts of the Moldavian Autonomous Soviet Socialist Republic to form the Moldavian Soviet Socialist Republic,Henceforth references to "Soviet Socialist Republic" are abbreviated "SSR" while territories in the north and the south of Bessarabia were transferred to the Ukrainian SSR. Axis-aligned Romania recaptured the region in 1941 with the success of Operation München during the Nazi invasion of the Soviet Union, but lost it in 1944 as the tide of war turned. In 1947, the Soviet-Romanian border along the Prut was internationally recognised by the Treaty of Paris that formally ended hostilities of World War II.