At a series of high-level meetings in May, the Big Six first seriously discussed ending the war—but none of them on terms that would have been acceptable to the Allies. Because anyone openly supporting Japanese surrender risked assassination by zealous army officers, the meetings were closed to anyone except the Big Six, the Emperor, and the Privy Seal—no second- or third-echelon officers could attend. At these meetings, despite the dispatches from Japanese ambassador Satō in Moscow, only Foreign Minister Tōgō realized that Roosevelt and Churchill might have already made concessions to Stalin to bring the Soviets into the war against Japan. As a result of these meetings, Tōgō was authorized to approach the Soviet Union, seeking to maintain its neutrality, or (despite the very remote probability) to form an alliance.