Naotake Sato

Naotake Sato was Japan’s ambassador in Moscow and a central voice in the book’s account of Japan’s wartime peace feelers through the Soviet Union. While Tokyo explored sending Prince Konoye to Moscow, Sato regarded negotiations with the Soviet government as futile and told Tokyo that Japan had no realistic route to ending the war short of unconditional surrender or something close to it. His assessment reached Harry S. Truman through intercepted communications and later resurfaced in a direct exchange between Truman and Joseph Stalin.

Ambassador in Moscow

In the period before the Potsdam Conference, Sato was conducting discussions with the Soviet government about the possibility of bringing the war to an end, acting on orders from Tokyo. On July 12, Foreign Minister Shigenori Togo sent him an urgent message conveying Hirohito’s desire for a swift termination of the war and proposing that Prince Konoye be dispatched to Moscow as a special envoy.

Sato rejected the proposal as unrealistic. He reported that Vyacheslav Molotov was not interested in such negotiations and concluded that Japan would have to accept unconditional surrender, or terms very close to it, if it truly wished to end the war. The account presents him not as a negotiator empowered to settle the terms, but as the diplomat communicating to Tokyo how little room he believed Soviet mediation offered.

The intercepted warnings

American monitors intercepted the messages and promptly passed them to Truman. The intelligence offered evidence that Tokyo was seeking a way to end the war, but it also carried a limit: Tokyo repeatedly warned Sato that Japan would not consent to unconditional surrender. The two strands—the search for an end to the conflict and resistance to the stated Allied condition—kept the peace overture from amounting to a clear acceptance of surrender.

The book places Sato’s reports beside a warning from the Combined Intelligence Committee that Japan might use peace overtures to sow division among the Allies. It also notes the memory of Japanese peace talks in Washington in December 1941, concurrent with the attack on Pearl Harbor. In this context, Sato’s assessment was significant intelligence, but it did not by itself resolve whether Tokyo’s approach represented a genuine path to peace or an effort whose terms remained incompatible with Allied demands.

At the Potsdam table

During a lunch at Potsdam, Stalin told Truman about the Japanese peace feeler and passed Sato’s message across the table. Stalin suggested that it might be best to delay the Japanese request by saying that the proposal to send Prince Konoye was too vague to answer. Truman, who already knew of the overtures from intercepted messages, gave no sign that he had seen them and left the response to Stalin.

Sato’s role therefore extended beyond his exchanges with Tokyo: his communications became part of the diplomatic information being handled by both Allied leaders. The episode underscores the distinction between a reported desire to end the war and agreement on the terms of peace. Sato had identified surrender, or something close to it, as Japan’s practical alternative; Tokyo’s repeated refusal to accept unconditional surrender left that difference unresolved.