They say that the enemy of your enemy is your friend, but did that apply to President Franklin D. Roosevelt and his Soviet counterpart, Joseph Stalin, during the Second World War?

Despite their ideological differences, the United States and the USSR joined ranks on January 1, 1942, attacked by Japan and Nazi Germany, respectively. Their leaders would meet for the first time almost two years later at the 1943 Tehran conference.

Don is joined by Phillips Payson O’Brien, Professor of Strategic Studies at St Andrews. Phillips is the author of 'The Strategists: Churchill, Stalin, Roosevelt, Mussolini and Hitler – How War Made Them, And How They Made War'.

Produced by Freddy Chick. Edited by Aidan Lonergan. Senior Producer is Charlotte Long.

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