Investigation by American authorities reveals existence of a boss in Japan

A Chinese organization is suspected of establishing a base in Japan to illegally export chemicals to make the synthetic drug fentanyl into the U.S. The Drug Enforcement Administration (DEA) in the U.S. is on the hunt for the group's leader, placing Japan in the center of mounting tensions between Washington and Beijing.

This Nikkei investigation analyzed a trove of open-source data to piece together a timeline of this case.

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