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Japan and the Soviet Union shared a common border in Manchuria and the German invasion of the Soviet Union weakened the Soviets greatly. In view of the advantages to Japan in seeing the Soviet Union defeated (not to mention the resources available in Siberia) and the fact that Japan had large Kwantung Army stationed there essentially doing nothing, why didn't Japan attack?

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Hawaii was slightly more attractive than Siberia. –  JoeHobbit Oct 14 '11 at 7:14
    
Because the Japanese knew they were going to lose, the only hope for the Asiatic races to escape European imperialism was to create Chinese nationalism by any means possible, hence the massive atrocities committed by Japanese forces were designed to unite the Chinese against them. The mantle of looking out for the Asiatic races passed from Tokyo to Beijing. The international borders are just illusions for the show. War doesn't care about arbitrary political delineations. –  Sam Apr 8 at 9:55
    
cont'd... and that's why the Japanese soldiers of WW2 are not judged as war criminals by those in the know. Hence the controversy everytime a Japanese PM visits that shrine. Yeah, it's a disgusting world isn't it. –  Sam Apr 8 at 10:04
    
when winning isn't a viable option, the best you can achieve is an honourable loss. –  Sam Apr 8 at 10:17
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@Sam: wtf. That's the most insane thing I've ever heard –  rotard Apr 9 at 18:06
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We have to delve into two spheres to address this question, the political and the military.

Militarily, the Japanese fought a series of border skirmishes with the Soviet Union at Khalkhin Gol (located along the Manchurian - Mongolian border, Mongolia then being a "People's Republic" and puppet of the Soviet Union) through early summer to early autumn 1939, with the main battle happening on August 20-31. Georgy Zhukov (who later went on to lead large formations in Europe, but then a Corps Commander) launched a coordinated combined arms attack which stunned the patently inferior Japanese, leading to a prompt cease-fire and cessation of hostilities on September 15, 1939.

Politically, the Japanese military cadres were always divided along two opposed doctrines: the Northern Expansion Doctrine (in which the Japanese Empire would expand north into Siberia) and the Southern Expansion Doctrine (in which the Japanese Empire would instead focus on South-East Asia and the greater Pacific) favoured by the Army and Navy respectively. The thorough paddling that the Imperial Japanese Army and the Kwantung Army received at Khalkhin Gol discredited the Northern Expansion Doctrine.

There are indications that the Japanese would have struck the Soviet Union had Operation Typoon succeeded and Moscow taken by the Germans, but this obviously never materialized. What a difference 50km can make!

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Excellent answer, only one addition to make: while Siberia was underdeveloped and underpopulated, most of the places along the Southern expansion route were already sufficiently developed to be readily exploited, and certainly sufficiently populated to make up a market for certain types of goods. This fact should be explored, but it proved to be more time consuming than I can afford. Perhaps somebody more into Japan(ese)? –  astabada Dec 22 '12 at 17:36
    
technically moreover the fighting was not between the USSR and Japan but between the USSR and Manchukuo (which was a Japanese satellite state set up in NE China). Of course in reality it was Japanese, but in literature it might be listed as Manchukuo –  jwenting Mar 7 at 11:48
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Japan was interested in extending its influence in Asia and for that it had to confront either USSR or USA. While I don't think that the exact reason for choosing USA is known, Japan was at a clear disadvantage when battling USSR: while the Soviet Union had established overland supply line for its troops in the far east (Trans-Siberian Railway) the Japanese had to supply their troops and transport reinforcements by sea. This already proved fatal for Japan in the Russo-Japanese War and only the civil unrest in Russia that eventually led to the 1905 Russian Revolutiоn saved Japan from a defeat. The history repeated itself in the Battles of Khalkhin Gol in 1939 and I guess that the Japanese learned their lesson.

The United States on the other hand could only defend their interests in Asia and Pacific by sea, same as Japan itself. So the chances here were equal and the attack on Pearl Harbor temporarily gave Japan a significant advantage - something that they couldn't achieve against Soviet Union.

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They had a treaty beginning in 1941, after a few skirmishes along the area in question. They were also a member of the Tripartite Pact, which they remainded a member of even after Germany attacked the Soviet Union

references: Wikipedia

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The Soviets kept a strong army in the Far East at all times, in case of Japanese attack, and the Japanese had come out a distinct second best in earlier battles. Opening up a front meant committing the Kwantung Army to battle, with all the logistics (never Japan's strong point) that implies, and a battle that the Japanese could not necessarily pull back from.

Further, there weren't all that many resources being exploited in Siberia, and Siberia's a very big place. After what was available near Manchuria, it was a very long trip to the Irkutsk area, the next place worth conquering.

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I think they would rather go for Kolyma River and these gold mines, if anything. But as you say a big place with not so many resources close to Japan. Anyone can check on the map where were Norilsk nickel mines, or where was Chelyabinsk with all the tank factories. Long long way from home. –  kubanczyk Oct 1 '12 at 20:40
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One important reason that Japan chose to go to war with the United States rather than the Soviet Union was because its navy was the stronger of its two arms.

The Japanese navy was quite competitive with the U.S. navy, even before Pearl Harbor (until the 1943 U.S. shipbuilding program kicked in). Not so the Japanese army, which had been defeated by Soviet forces on the Mongolian border in 1938, and lacked tanks and other heavy equipment.

Furthermore, Japan didn't have the logistics to fight a "two front" war, one on land and one at sea.

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They did attack the USSR a few times, but lost badly and decided to sign a treaty with the USSR. They quit with Russia because they wanted to expand farther into the Pacific to which Russia wasn't a threat to that goal. That's perhaps the biggest reason for the Raid on Pearl Harbor, Japan was worried that America would intervene and cause issues to the plan. They decided to launch a first strike to neutralize the possibility, by destroying the American fleet and holding us off for awhile. This however didn't happen because the main targets being our aircraft carriers were out to sea at the time of the attack.

The Invasion of Pearl Harbor ,History Channel

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US oil sanctions were crippling Japan and they came after the US to try and force FDR into negotiations and cripple our Navy that he had moved from San Diego to Honolulu, the only force capable of stopping the Japanese from taking the oil fields in the Indies. In other words they were desperate for oil and had to remove the threat of the US Navy before they could think about war with Russia.

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I think your answer covers a really interesting aspect of the problem. However I strongly suggest to add references. Upvoted answers always have references. And welcome to history@se! –  astabada Jan 2 '13 at 8:49
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As was stated in another answer, there were a number of skirmishes/battles that occurred in 1939, such as the Battles of Khalkin Gol, but it essentially concluded when it became apparent that Japan was not a military match against the Russians. This basically guaranteed that Germany and Japan would never link up as allies on land.

For more information about the battle, I'm going to forward you to the wikipedia page: http://en.wikipedia.org/wiki/Battles_of_Khalkhin_Gol

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I don't know, if they could go after one of the strongest navies in the world at the time, they could have probably fended off the Russians...if they had dedicated the manpower to it. the logistics would have been easier at least. An interesting what-if question for sure. –  canadiancreed Oct 11 '11 at 20:44
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@canadiancreed: Actually, Japan's (and the Axis') best chance to win World War II was for Japan to launch an amphibious invasion of India, followed by a link up with Germany in the Middle East, not Russia. seekingalpha.com/instablog/399221-graham-and-dodd-investor/… –  Tom Au Feb 17 '12 at 1:12
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In August 1939, while Japan and the USSR were skirmishing, Germany and the USSR signed a Non-Aggression Pact that allowed Stalin to put some more focus on Japan (among other things). By early 1941, Japan decided it was time to focus on securing its oil supply in Indonesia and so shifted to its Pacific strategy. Hence they signed a neutrality pact with the USSR in April 1941. Germany showed no signs of a policy shift until June 22, 1941, when it abruptly attacked the Soviet Union.

With regard to the USSR, Germany was like "we got this." All through 1941 while Japan was prepping Pearl Harbor, Germany was wailing on Russia. When Pearl Harbor happened, the Wehrmacht was at the gates of Moscow. The Nazi leaders were debating whether to start killing the Jews right away, or "in the spring, after the war" meaning 1942. Likewise, Japan expected its expansion in 1941-42 to present the West with a fait accompli, that the USA would have neither the resources nor the willpower to fight, and that if they did, it would take several years to recover from Pearl Harbor and present a new threat in the Pacific. In other words, they could focus on China, and the USSR if they wanted, later. It did not work out that way.

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Japan and Germany had a political and military alliance during World War 2, as Japan was part of the Axis powers. When Japan attacked Pearl Harbor on December 7th, 1941, the U.S. declared war on Japan the following day. As you would expect, Germany (Japan's faithful ally) then declared war on the United States on December 11th, 1941. So yes, when Germany invaded the Soviet Union, it's puzzling that Japan did not honor its alliance by attacking the U.S.S.R. Such an arrangement would have divided the Soviet military in two and assured a victorious invasion for Hitler.

So, why on EARTH would Japan cross the Pacific to fight a neutral United States when its own ally was at war with neighboring Soviet Union?

Recent details have come to light that finally answer the question. In the mid 1990's, after the collapse of the Soviet Union, certain KGB archives revealed that Soviet spycraft actually engineered the war between the United States and Japan. This new information, stemming from the Venona Project, shows that Soviet penetration of the U.S. State Department and Treasury Department played a key role. Specifically, Harry Dexter White, a senior economist at the U.S. Treasury, was instructed to author key conditions during diplomatic exchanges between the U.S. and Japan. The key conditions were designed to start a war. The main condition was the demand that Imperial Japan withdrawn from all occupied territories This condition in particular convinced Japan that the U.S. was committed to war in the Pacific. In essence, Japan felt that they HAD to fight the United States. (Check out 'The Venona Secrets' by Herbert Romerstein & Eric Breindel as well as 'The Battle of Bretton Woods' by Benn Steil).

Once the Soviet Union was assured that their American agents had issued the hardline conditions, the Soviets could confidently focus on a one-front war instead of a two-front war. On December 4th, three days BEFORE the attack on Pearl Harbor, the Soviet Union confidently moved nearly all of its eastern land forces...forces that would have fought against Japan...into the western front to counter Hitler's fast-moving invasion. From a military standpoint, its dangerous to turn your back on the ally of your enemy (Japan) unless you are absolutely certain they will not attack.

Militarily, Japan had MUCH better chances fighting a country that was right next door and already heavily engaged in fighting Nazi Germany, which happened to be Japan's military ally. It is truly a miracle of statecraft that Japan was tricked into attacking a neutral nation nearly 3,000 miles away.

Also of interest...the Soviet Union, who was supposedly an ally of the United States in fighting Hitler...never declared war on Japan until AFTER the atomic bomb was dropped in 1945. After that, the Soviets moved their forces back to the east and promptly invaded Manchuria. Pretty nifty spycraft.

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what does "two-thirds of the Japanese military units be leased to the United States" mean?! how do you lease a battalion to another country?! –  sds Mar 5 at 18:34
    
Also check out 'Operation Snow: How a Soviet Mole in FDR's White House Triggered Pearl Harbor' by John Koster. Harry Dexter White was known as 'The Jurist' in Soviet cables and was acting in accordance in NKVD [pre-KGB] designs to trigger a war between Japan and the United States. The U.S.S.R. obviously benefitted the most since it prevented a war with Japan, while attacking the U.S. was strategic suicide for Japan. The bizarre choice to attack the U.S. instead of the U.S.S.R. is the very reason this question exists on this website in first place. It's fascinating. –  Doug Mar 7 at 0:33
    
your answer makes no sense. Japan certainly had its sights on Siberia, they just had a longer time scale in mind, wanting to pacify China first (which of course never happened). –  jwenting Mar 7 at 11:49
    
@sds the employment of mercenary batalions rented out by one nation to another is well known, in fact the US supplied such to China during WW2 in the form of the "flying tigers". To claim that the Japanese military during WW2 was actually fighting FOR the Americans however is utterly ludicrous. –  jwenting Mar 7 at 11:51
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