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More money toward Japan, why they are not doing in Russia or North Korea?

Japan is on good terms with USA, I can't say that much about China, Russia and N. Korea... Not that being in good terms with USA is a good thing, but Amazon is based on USA so...

Yes. It seems Japan is a favorite hehe.

They'd sure need that much money, particularly for the infrastructure to run it there.

Yeah. Amazon is expanding.