Actually the British and Soviets invaded Iran in August 1941, and used Iran's railways to ship US goods from the Persian Gulf to the USSR.
Earlier, in May 1941, Britain had invaded Iraq following a pro-Axis nationalist seizure of power in Baghdad. The pro-British monarchy and politicians were restored. After the war, this same pro-British Establishment had serious legitimacy problems and finally were overthrown in a combined coup and revolution in 1958.
The difference, I suppose, between an "n" and a "q."