Hokushin-ron

• 1. Introduction

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  Hokushin-ron gave Imperial Japan a compass: point the empire's expansion north, into Manchuria and Siberia, not south across the Pacific. Its backers were sometimes called the Strike North Group, convinced that no other direction offered Japan comparable economic and territorial value. For much of the interwar period, the Imperial Japanese Army rallied behind this northern vision. Then the doctrine collapsed, undone by military failure on a distant frontier. In its place rose a rival policy aimed at Southeast Asia and the Pacific islands. It was built to strip resources from European colonies and to check the power of Western navies. What convinced an army that Siberia was worth the risk? And what went wrong on the ground that Japan's own soldiers could not overcome?

• 2. Origins

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  The First Sino-Japanese War of the 1890s marked the point when Hokushin-ron began to dominate Japanese foreign policy. This thinking guided the Japanese invasion of Taiwan in 1895 and the Japan-Korea Treaty of 1910, which annexed Korea to Japan.

  After the Russo-Japanese War of 1904-1905, Field Marshal Prince Yamagata Aritomo helped shape the doctrine's strategy. As one of Hokushin-ron's key political and military architects, he traced the lines of a defensive strategy against Russia.

  A February 1907 Imperial National Defence guideline laid out two rival strategies for Japan's military planners. One, called Nanshu Hokushin Ron, meant defense in the south and advance in the north. The other, Hokushu Nanshin Ron, meant defense in the north and advance in the south. Intense debate over these two theories continued inside Japan for years afterward.

  After World War I, Japanese troops joined the Siberian Intervention, part of the Allied intervention in the Russian Civil War. The hope was that detaching Siberia and creating an independent buffer state would free Japan from any future Soviet threat. Japanese troops remained until 1922, long enough that strategic planners began seriously discussing permanent Japanese occupation of Siberia east of Lake Baikal.

  That ambition needed one more piece to become real: physical control of Manchuria itself.

• 3. Invasion of Manchuria

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  Seizing Manchuria became the essential first move in the Hokushin-ron strategy, giving Japan a direct land border with the Soviet Union. In 1931, insubordination among Japanese military personnel in the Kwantung Army triggered the Mukden Incident, giving Japan its pretext to invade Manchuria.

  The Kwantung Army could field only 12,000 men for the invasion, far too few without reinforcement. War Minister Sadao Araki firmly backed Hokushin-ron and any attack on the Soviet Far East and Siberia. He moved Chōsen Army forces from Japanese Korea into Manchuria to reinforce the Kwantung Army, without seeking permission from Tokyo.

  Prime Minister Reijirō Wakatsuki could only protest weakly once the plot to seize Manchuria was already a fait accompli. He resigned along with his cabinet, and when the new government formed, Araki held the real power in Japan as War Minister. A puppet state called Manchukuo was established across Northeast China and Inner Mongolia, governed as a constitutional monarchy.

  Controlling Manchukuo settled the question of territory. It did not settle who inside the Japanese military would decide what came next.

• 4. Army Factionalism

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  General Kenkichi Ueda believed Japan's greatest enemy was communism, and that its destiny lay in conquering the resources of a sparsely populated northern Asia. General Yukio Kasahara likewise championed Hokushin-ron, convinced the Soviet Union represented both Japan's greatest danger and its greatest opportunity.

  The Imperial Way Faction, known as Kōdōha, drew young ultranationalist activists who wanted a preemptive strike against the Soviet Union. Rival officer cliques like this one each claimed to speak for the Emperor's true will, splitting the Army into competing camps. Its members viewed communism as a direct threat to their spiritual values and to the Emperor's divinity.

  The Control Faction, or Tōseiha, took the opposite view, favoring cautious expansion and tighter discipline within the Army. Its officers treated war with China as the more urgent priority. They saw the United States and Great Britain as the greater long-term threat in the Pacific.

  Tensions between the Japanese Army and Navy traced back to the Meiji period, and were rarely cordial. From the early 1930s, the Army viewed the Soviet Union as Japan's greatest threat and backed Hokushin-ron's focus on the Asian continent. The Navy looked instead across the Pacific, treating the United States as the greater danger and backing Nanshin-ron's focus on Southeast Asia and the Pacific islands.

  By the mid-1930s the two services' incompatible ambitions raised a real possibility: the Army and Navy might come to blows.

• 5. The Fracture of 1936

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  Kōdōha officers dominated the Army's staff positions throughout Araki's tenure as Minister of War, from 1931 to 1934. Araki's resignation in 1934, forced by ill health, let Tōseiha officers replace many of these Kōdōha appointees.

  In 1936, young Kōdōha-affiliated Army officers launched a failed coup, the February 26 Incident. The Army purged its Kōdōha generals afterward, including Araki, who was forced into retirement in March 1936.

  The Imperial Defence Plan, drafted in June 1936, tried to balance Hokushin-ron and Nanshin-ron by keeping both the Army and Navy peaceful toward their rivals. Its real goal was securing raw materials, petroleum above all, that Japan needed but did not produce itself. Northward expansion meant attacking the Soviet Union through Manchuria to reach Siberia's resources. Southward expansion meant seizing the Dutch East Indies, now Indonesia, along with French and British colonies. Japan called this vision a Greater East Asia Co-Prosperity Sphere. Pursuing it risked, and in some quarters even invited, a large-scale war with the world's great powers. European powers had dominated Southeast Asia for more than a century, leaving Japan little diplomatic experience there.

  In November 1936, Japan and Nazi Germany concluded the Anti-Comintern Pact. The pact bound both countries to consult on measures "to safeguard their common interests" if the Soviet Union attacked either one. Neither side would sign a political treaty with the Soviet Union, and Germany agreed to recognize Manchukuo.

  None of this diplomacy stopped Japanese and Soviet forces from already testing each other along the Manchurian border.

• 6. Border Conflicts

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  A string of clashes along the Soviet-Manchurian frontier began in 1932, none of them formal declarations of war. Aggressive moves by Japanese staff and field officers along the Manchukuo-Mongolia border escalated into the Battles of Khalkhin Gol in 1939.

  The Kwantung Army suffered heavy casualties there, a blow that badly damaged its vaunted reputation. Soviet superiority in numbers and armor proved that any further push north into Siberia was impossible.

  General Ueda kept backing his officers' actions anyway, refusing to rein them in and remaining firm in his support for Hokushin-ron. He was recalled to Japan in late 1939 and forced into retirement. The Kwantung Army itself was purged of its most insubordinate officers along with its remaining Hokushin-ron supporters.

  With Hokushin-ron's last field champion gone, the Army's failure back home was about to hand the initiative to the Navy.

• 7. Abandonment

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  The Army's failures in the border conflicts cost it prestige, and the Navy gained the ascendancy instead. Powerful industrial zaibatsu backed the Navy too, convinced that meeting its needs served their own interests best.

  Military setbacks on the Mongolian front, the ongoing Second Sino-Japanese War, and hostile Western attitudes together pushed Japan toward Nanshin-ron. The new goal was securing colonial resources in Southeast Asia while neutralizing the threat of Western military forces in the Pacific.

  In April 1941, Japan and the Soviet Union signed the Soviet-Japanese Neutrality Pact, freeing Japan to prepare for war in the Pacific. When Nazi Germany invaded the Soviet Union in June 1941, Japan did not join its Axis ally there. It chose not to open a second front in the Far East. Japan would not engage the Soviet Union militarily again until the Soviets declared war in August 1945.

  That declaration in August 1945 marked the Soviet Union's return to the same Manchurian frontier where Japan's northern ambitions had first taken shape.