 The Finns retained their sovereignty and improved their international reputation, which bolstered their morale in the Continuation War.In accordance with the Soviet-Nazi Molotov–Ribbentrop Pact of 23 August 1939, the Red Army invaded Poland on 17 September 1939, after the Nazi invasion on 1 September 1939.On 30 November the Red Army also attacked Finland, in the Winter War of 1939–1940.