The United States recently repatriated a Chinese national suspected of drug trafficking, a "first" such return in recent years, Beijing's public security ministry said on Friday. China is the primary origin of precursor chemicals used to make fentanyl , a highly potent opioid underpinning a deadly drug epidemic in the United States. Beijing says it is open to working with Washington on curbing the crisis, although the United States maintains an extra 10% tariff on Chinese goods it says is to