The Chinese government restricted the shipment of specific chemical ingredients used to manufacture fentanyl destined for the US, Mexico, and Canada. The additions target two precursor chemicals, expanding the national export-license list to a total of 18 regulated substances, according to the South China Morning Post.

The restrictions precede the arrival of President Xi Jinping in the US for scheduled meetings with President Donald Trump. While some observers state the move demonstrates the state's ability to control drug distribution, others characterize the action as a token diplomatic gesture intended to signal cooperation on narcotics control.