Stalin believed that Germany would not invade the Soviet Union until Britain and France had been conquered. From Stalin's own calculations, this would not be until the summer of 1942.
Some of his closest advisers began to argue that 1941 would be a much more likely date. The surrender of France in June, 1940, also cast doubts on Stalin's calculations.
Operation Barbarossa
Stalin's response to France's defeat was to send
Vyacheslav Molotov to Berlin for more discussions. Molotov was instructed to draw out these talks for as long as possible. Stalin knew that if
Adolf Hitler did not attack the Soviet Union in the summer of 1941, he would have to wait until 1942. No one, not even someone as rash as Hitler, would invade the Soviet Union in the winter, he argued.
Germany was now in a strong negotiating position and Molotov found it impossible to agree to Hitler's demands. As soon as talks broke-up, Hitler ordered his military leaders to prepare for
Operation Barbarossa. The plan was for the invasion of the Soviet Union to start on the 15th May, 1941. Hitler believed that this would give the German Army enough time to take control of the country before the harsh Soviet winter set in.
Information on the proposed invasion came to Stalin from various sources.
Richard Sorge, an agent working for the
Red Orchestra in Japan, obtained information about the proposed invasion as early as December, 1940.
Winston Churchill sent a personal message to Stalin in April, 1941, explaining how German troop movements suggested that they were about to attack the Soviet Union. However, Stalin was still suspicious of the British and thought that Churchill was trying to trick him into declaring war on Germany.
When Sorge's prediction that Germany would invade in May, 1941, did not take place, Stalin became even more convinced that the war would not start until 1942. The reason for this delay was that Germany had invaded Yugoslavia in April.
Adolf Hitler had expected the Yugoslavs to surrender immediately but because of stubborn resistance, Hitler had to postpone
Operation Barbarossa for a few weeks.
On 21st June, 1941, a German sergeant deserted to the Soviet forces. He informed them that the German Army would attack at dawn the following morning. Stalin was reluctant to believe the soldier's story and it was not until the German attack took place that he finally accepted that his attempts to avoid war with Germany until 1942 had failed.