272 A Short History of the Middle East Soviet Embassy in Tehran, which had for several weeks avoided contact with the previous Prime Minister, promptly paid courtesy visits to Qavam; and on their invitation he set off for Moscow on 19 February at the head of a carefully-picked mission. While American and British troops were withdrawn before 2 March, the day appointed for the withdrawal of all foreign troops from Persia, the Soviet radio announced on I March, while Qavam was still negotiating in Moscow, that Russian troops would be with- drawn 'from those parts of Persia which are undisturbed; those in other areas would remain pending a clarification of the situation'. Qavam returned to Persia without reaching any agreement; but on 3 April the Persian delegate informed the Security Council that ten days previously the Soviet Ambassador had informed the Persian government that the Red Army would begin its evacuation im- mediately and complete it in five to six weeks; he had also proposed a joint Soviet-Persian oil corporation and an autonomous govern- ment for Azerbaijan. On 5 April an agreement was signed setting up a joint oil-company in North Persia for a period of fifty years. For the first twenty-five years Russia was to own 51 per cent, of the shares, to pay the costs of prospecting and provide the machinery, and in return receive half the oil. Persia was to be free to dispose of the other half, but for geographical reasons Russia would be the most likely buyer. Concessions to other Powers in North Persia were barred.1 The evacuation of British troops duly began, and an Azerbaijani mission led by Pishevari arrived in Tehran for talks with the Persian government. Qavam had meanwhile been sup- pressing the most actively anti-Russian elements in Persian political life, threatening in a radio speech to 'destroy them like harmful insects'. His negotiations with the Azerbaijanis were none the less difficult, since at the first obstacle that presented itself Tabriz radio announced a treaty of mutual assistance with the "national govern- ment* of Persian Kurdistan, where unruly tribes had with Russian support been in revolt against the central government for some • years. When a second deadlock was reached, the Persian spokes- man having informed the Security Council that his government was unable to confirm the Russian evacuation of Azerbaijan as it did not exercise;, effective authority there, pressure was again exerted on it through a Tabriz radio allegation of a Persian armed attack and the proclamation of a military government in Azer- 1 Times Tehran correspondent, 11 July 1947,