In 1941, Japan massed 700,000 men on the Soviet border while Stalin fought Hitler. Why did Japan never attack the Soviet Union?

The usual answer is Nomonhan. In 1939, Georgy Zhukov crushed a Japanese division on the Mongolian steppe, Japan learned its lesson, signed a pact with Stalin, and turned on America. That defeat was real, but it is only one thread. Two years later the same army was mobilizing on the same border, and Japan's leaders had made a conditional invasion of the Soviet Far East official policy. What stopped them shaped the fate of Moscow and Pearl Harbor.

The story begins on June 22, 1941, when Foreign Minister Yosuke Matsuoka urged Emperor Hirohito to strike the Soviet Union, ten weeks after signing the Soviet-Japanese Neutrality Pact in Moscow. It follows the July 2 Imperial Conference and the Kwantung Army Special Maneuvers, the old rivalry between the army's northern road and the navy's southern road from the Russo-Japanese War and the Siberian Intervention, the battles at Lake Khasan and Khalkhin Gol, and the shock of the Nazi-Soviet pact. It covers Prince Fumimaro Konoe's cabinet reshuffle, Japan's dependence on American oil, the move into southern Indochina, Roosevelt's asset freeze of July 26, 1941, and the ripe persimmon condition the army set for attacking. It then follows the August 9, 1941 decision, Richard Sorge's reports to Moscow, the Pacific route for American aid to Vladivostok, and the Soviet invasion of Manchuria in August 1945.

The video also names the human costs of the war. Japan's war in China cost millions of Chinese lives, millions died under occupation, forced labor, and famine in Southeast Asia, and Masanobu Tsuji helped organize the mass killing of Chinese civilians in Singapore. In 1945, Japanese settlers fled Manchuria, and about 575,000 Japanese prisoners were sent to Soviet labor camps, where at least 55,000 died.

Subscribe for history that looks past the famous battle to the decisions behind it. Of the four brakes on Japan's army, which do you think weighed most in August 1941?

Sources:

Eri Hotta, Japan 1941: Countdown to Infamy, 2013

Takshashila Institution, The US-Dutch Oil Embargo and Pearl Harbor, 2025

Imperial Conference of July 2, 1941, Outline of National Policies, International Military Tribunal for the Far East records

U.S. Department of State, Foreign Relations of the United States, 1939, 1940, and 1941

Ribbentrop telegram to Ambassador Ott, July 10, 1941, Harvard Law School Nuremberg Trials Project

Yalta Conference Agreement, 1945, Avalon Project, Yale Law School

Encyclopaedia Britannica, Russo-Japanese War, Richard Sorge, and Tsuji Masanobu

University of California, Davis, Japanese in Siberia project

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