That's import and export, not the investment and sales.I mean relative to each country's overall size of economy, actually S.Korean is a bigger trading partner to China than Japan, Japan will become a less and less relevant business partner to China in the future.
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And yes, China will probably try to decouple from Japan and vice versa, but that's on both of them.
It has nothing to do with Germany being more independent or whatsoever, considering it alienates its bigger brother Russia, much more than Japan has alienated China.
In fact, when Russia falls, China is next.