Muslims in the middle east are considered aryans so the German's, Hitler, viewed them as blood brothers. Hence, he didn't need a formal agreement with them. They also had worked together since the time of the Ottoman Empire and the Muslims did not like the British Empire's meddleing in their affairs. The closeness of the Nazis with middle eastern countries is evident in the films Raiders of the Lost Ark and the one about the Holy Grail.
No only the Iranians are Aryan.