BBC NEWS | Europe | Who won World War II?: "The Nazi regime collapsed in May 1945, squeezed ever more tightly between two fronts - the Soviet Union on one side and the Western Allies on the other.
But which of these fronts was the most important?
Allied aid to the Soviet Union, from food to lorries, played a vital role
Throughout the Cold War, and ever since, each side has tended to see its own contribution as decisive.
'In the West, for some time... public opinion has taken the view that the Soviet Union played a secondary role,' says the Russian historian Valentin Falin.
On the other hand, opinion polls show that two-thirds of Russians think the Soviet Union could have defeated Hitler without the Allies' help, and half think the West underestimates the Soviet contribution."