On July 30, Ambassador Satō wrote that Stalin was probably talking to Roosevelt and Churchill about his dealings with Japan, and he wrote: "There is no alternative but immediate unconditional surrender if we are to prevent Russia's participation in the war." On August 2, Tōgō wrote to Satō: "it should not be difficult for you to realize that ... our time to proceed with arrangements of ending the war before the enemy lands on the Japanese mainland is limited, on the other hand it is difficult to decide on concrete peace conditions here at home all at once."