[4] Stalin apparently examined the scrap of paper and pondered it for a moment, wrote a large check in blue pencil and handed it back to Churchill.[4] Roosevelt was conditionally supportive but was ultimately unhappy with the level of US influence in the Balkans, specifically Bulgaria, which was the sticking point for the discussion.[6] Norman Naimark states that it "confirmed that Eastern Europe, initially at least, would lie within the sphere of influence of the Soviet Union".The United Kingdom's principal representatives were Winston Churchill, the prime minister, and Anthony Eden, the foreign secretary.The Chief of the Imperial General Staff, Field Marshal Sir Alan Brooke was also present, as were the United States ambassador to Moscow, Averell Harriman, and General John R. Deane, head of the United States Military Mission in Moscow as observers.