Hertza region
As a result of the Molotov–Ribbentrop Pact of August 1939, the Romanian government was forced to accept the Soviet ultimatum of June 26, 1940, and withdrew from Bessarabia and Northern Bukovina. These regions (as well as the Hertza region) were then incorporated into the Soviet Union, most of the former being organized as the Moldavian SSR, while the other areas were attributed to the Ukrainian SSR.