In May 1950, a treaty of friendship was signed by Prime Minister Liaquat Ali Khan and Mohammad Reza Pahlavi. Some of the clauses of the treaty of friendship had wider geopolitical significance. Pakistan found a natural partner in Iran after the Indian government chose to support Egyptian President Gamal Abdel Nasser, who was seeking to export a pan-Arab ideology that threatened many of the more traditional Arab monarchies, a number of which were allied with the Shah of Iran. Harsh V. Pant, a foreign policy writer, noted that Iran was a natural ally and model for Pakistan for other reasons as well. Both countries granted each other MFN status for trade purposes; the Shah offered Iranian oil and gas to Pakistan on generous terms, and the Iranian and Pakistani militaries extensively cooperated to suppress the rebel movement in Baluchistan. During the Shah's era, Iran moved closer to Pakistan in many fields. Pakistan, Iran, and Turkey joined the United States-sponsored Central Treaty Organization, which extended a defensive alliance along the Soviet Union's southern perimeter. Iran played an important role in the Indo-Pakistani War of 1965, providing Pakistan with nurses, medical supplies, and a gift of 5,000 tons of petroleum. Iran also indicated that it was considering an embargo on oil supplies to India for the duration of the armed conflict. The Indian government firmly believed that Iran had blatantly favoured Pakistan and sought to undermine India during the war. After the suspension of American military aid to Pakistan, Iran was reported to have purchased ninety F-86 Sabrejet fighter planes from West Germany, and subsequently delivered them to Pakistan.