Portrait of Joseph Stalin
Stalin was very aware that the western part of Germany was always going to be more prosperous and secure than the eastern zone.
He was worried that the West would take advantage of their stronger position and unite all their zones, and eventually take over the eastern part.
On 24 June 1948, Stalin cut all land access to Berlin for the Allies. This became known as the Berlin Blockade.
Stalin did not intend to risk war over Berlin, and he did not intend to ‘drive the Allies out’.
More likely, his intention was to show that the Soviets also had power in Germany which could match the demonstrations of economic power and unity that the West had just shown.
He was using the Blockade as a lever to prevent any further western moves in Germany, rather than attempting some kind of communist takeover.