FILE - President Joe Biden greets China's President President Xi Jinping at the Filoli Estate in Woodside, Calif., Nov, 15, 2023, on the sidelines of the Asia-Pacific Economic Cooperative conference. China has agreed to curtail shipments of the chemicals used to make fentanyl, the drug at the heart of the U.S. overdose epidemic. Experts say it's an essential step, but it's not the only thing needed to be done to stem the crisis. (Doug Mills/The New York Times via AP, Pool, File)
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