An Allied Japan makes Pearl Harbor strategically incoherent

What happens if Japan aids Britain after France falls but still attacks Pearl Harbor?

The assumptions conflict: Allied access to fuel reduces Japan's motive for Pearl Harbor and may instead draw the United States into the European war.

The scenario gives Japan supplies and combat experience while fighting alongside Britain. British access to Persian Gulf and imperial oil removes much of the resource pressure that historically drove Japanese expansion south. The United States would then face an increasingly experienced and influential Japan inside the Allied coalition. Washington might enter the European war to shape the settlement, but the assumptions no longer provide a coherent Japanese reason to attack Pearl Harbor.