The paper was presented at the symposium on British political and military strategy in Central, Eastern and Southeastern Europe in 1944, held in London in December 1984. The author surveys the relevant scientific literature and references dealing with these questions and analyses the major problems mutual disagreements and suspicions, illustrating them with newly discovered fragments from Tito's and Kardelj's works. The prime concern of the partisan leaders was focused on the possibility of the allied forces' disembarkation and intervention in Yugoslavia. The paper also reveals and compares the data on the help and provisions supplied by the British and the Soviets to the Yugoslav National Liberation Army.