To this end, Stalin and Molotov strung out the negotiations with the Japanese, giving them false hope of a Soviet-mediated peace.[56] At the same time, in their dealings with the United States and Britain, the Soviets insisted on strict adherence to the Cairo Declaration, re-affirmed at the Yalta Conference, that the Allies would not accept separate or conditional peace with Japan. The Japanese would have to surrender unconditionally to all the Allies. To prolong the war, the Soviets opposed any attempt to weaken this requirement.[56] This would give the Soviets time to complete the transfer of their troops from the Western Front to the Far East, and conquer Manchuria (Manchukuo), Inner Mongolia (Mengjiang), Korea, Sakhalin, the Kuriles, and possibly, Hokkaidō[57] (starting with a landing at Rumoi).[58] However, it was well known that the Soviet invasion of Hokkaido was unlikely as they lacked the capability to invade the Japanese home islands, let alone to capture Hokkaido (see Soviet's lack of capability to invade Japan).[citation needed]