In what way did Japan's invasion of China help spark conflict in Europe?

there could be many factors but im sure the main one was that japan was a german ally and for them to invade china was scary to the allies because it could mean more goods for Nazi Germany also another reason was because the us was allies with china and saw it as their duty to protect the smaller country and the more the japs invaded the closer they got to the american base in the Philippines

what

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