Occupation of Iran in World War 2

Perhaps fortunately, the allied plans for a grand anti-soviet/German strategy collapsed when Finland did.  Those plans included using bombers to attack the USSR, which would have almost certainly have provoked a soviet attack on Turkey and Iraq, causing massive disruption to the British Empire and their probable defeat.  Further, the pathetic success rate of unguided bombers in 1939 suggests that, even if Stalin did not order retaliation, they would only hit empty land.