From From the Manchurian Incident to continue the war that has taken the most important issue was to secure oil, has come to sight the Pacific War （Greater ahjeonjaeng） in order to prepare for was also very important to secure oil.

The Netherlands East Indies Lumpur also become a major goal at this point in Indochina, Japan, as was buteoinde hamburo eopeotdeongeot handle during the attack damaged wells and refineries in Japan's technology-based because I could not recover. In addition, a large offshore operations haetdaganeun seotbulri excuse b e h a - v i o r in the U.S. are very careful, because the planting has been geondeulilsu.

So the Japanese decided to compromise rather than war in the East Indies as Kobayashi had to send three oil companies.
And then he was in charge of the nearly 3,150,000 tons annually to the board Mock oil exports are asking you.
Jungiljeonjaeng eopeotdeongeot no choice until the beginning of two of Japan's largest oil-dependent country was the United States in the United States. Iltong phase of the treaty expired in Japan, the United States no longer is anatdeongeot not export oil.

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I DON'T KNOW.