Against which country did Russia declare war in 1939?
World War II by country Mongolia between May–August, 1939. Later that year, protected with the Molotov–Ribbentrop Pact, it invaded eastern Poland about three weeks after the Germans invaded the west of the country. During the next eleven months the Soviets occupied and annexed the Baltic states. The Soviet Union supported Germany in the war effort against Western Europe through the 1939 German–Soviet Commercial Agreement and larger 1940 German–Soviet Commercial Agreement with supplies of raw materials that were otherwise blocked by the British naval blockade. Following Finland's refusal of Soviet demands for military bases and a territorial swap, the Soviet Union invaded on 30 November 1939,
German declaration of war against the United States Germany was obliged to come to the aid of Japan if a third country attacked Japan, but not if Japan attacked a third country. Ribbentrop reminded Hitler of this, and pointed out that to declare war against the US would add to the number of enemies Germany was fighting against, but Hitler dismissed this concern as not being important, and, almost entirely without consultation, chose to declare war against the US, wanting to do so before, he thought, Roosevelt would declare war on Germany. In fact, Hitler's declaration of war came as a great relief to British Prime Minister Winston