To Stalin's surprise, the Western Allies did not particularly oppose the AVNOJ's decisions. The flow of British equipment and arms to the Partisans which had started in the second half of 1943 on the basis of the Churchill's Mediterranean strategy remained unbroken. Only days after conclusion of the second session of the AVNOJ, the Allies recognised the Partisans as an Allied force at the Tehran Conference, and cut off further aid to the Chetniks. On British Prime Minister Winston Churchill's urging, the government-in-exile led by Ivan Šubašić and the Tito-led NKOJ signed the Treaty of Vis on 16 June 1944. Through the agreement, the government-in-exile recognised the AVNOJ and pledged to support it. In return, the NKOJ agreed to postpone the decision on the constitution of Yugoslavia until after the war. Tito and Šubašić concluded another agreement, this time in Belgrade on 1 November, in which Šubašić confirmed AVNOJ as Yugoslavia's legislative body and agreed to form a new 18-person government. Six of the members would come from the government-in-exile and twelve would be NKOJ members. The second session of the AVNOJ also drew a response from the Chetnik leadership. At the Ba Congress held in January 1944, they proposed an alternative solution for the post-war government. The congress also condemned the AVNOJ in line with the contemporary Chetnik propaganda as a product of collaboration of Communists and Ustaše against Serbs.