The correct answer is Berlin.
On June 24, 1948, the Soviet Union blocked all road and rail travel to and from West Berlin, as a response to the refusal of American and British officials to allow Russia more power in the economic future of Germany.
President Harry S. Truman ordered an extensive airlift of supplies into West Berlin until the Soviet Union lifted the blockade in 1949, at a total expense of $224 million and after the shipment of 2,323,738 tons of food, fuel, machinery, and different supplies.