Few Americans know that a major reason Japan chose to attack Pearl is that they had the absolute crap kicked out of them in 1939 by the Red Army in Manchuria. Zhukov, who we would hear from again, forced them to fight a stand-up mechanized warfare battle and destroyed something like 3/4 of the Japanese force.
The Japs decided they maybe didn't want to conquer Siberia after all and went with the alternative "Strike South" strategy of the Navy, which, at least in the Jap strategists' minds, required taking out the US Pacific Fleet.
Thus Pearl Harbor.
Due to the US Oil Embargo, the Japanese Navy only had reserves enough for 6 months to a year of combat operations had they not seized the Dutch oil fields (& returned them to operation). Thus the entire IJN might have been literally tied up at the piers if the "Strike South" stategy had not succeeded in gaining approval.