China says US fentanyl sanctions are 'smears and suppression' just days after apparent agreement to work with Washington

China has voiced its "strong dissatisfaction" against sanctions on companies and individuals accused of helping to fuel the fentanyl crisis in the United States.

The comments came just days after Secretary of State Antony Blinken said the two countries had agreed to explore a working group on stemming the flow of chemicals that can be used to make the drug to Mexico.

Before 2019, China was believed to be the main source of illicit fentanyl entering the US before Beijing imposed stricter export controls at Washington's request.

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Since then, although the final production capacity has largely moved to countries like Mexico, the US has said China remains the main source for key ingredients and has targeted those it accuses of being involved in their supply.

Beijing has always strongly denied involvement and said that it is a "domestic" problem for the US.

On Wednesday, Yu Haibin, deputy head of the National Narcotics Control Commission, told a press conference: "China expresses strong dissatisfaction with the United States' repeated use of the drug issue as a reason to sanction Chinese businesses and citizens, thereby smearing and suppressing China."

Yu accused Washington of "continuously hyping" the flow of Chinese chemicals into Mexico and insisted China had fulfilled its international obligations and taken the lead in regulating an entire class of fentanyl substances.

"The US claims that the precursors to fentanyl processed in Mexico originate from China, but the chemicals and related equipment involved are not regulated under international narcotics conventions or the laws of China and Mexico," Yu said.

He also said that items mentioned in US sanctions such as "tablet presses, capsule filling machines and tablet press moulds" are also not subject to regulations but are instead classed as "common goods".

Two days earlier, Blinken said he had raised the issue of synthetic opioids as a "priority" during his two-day visit to Beijing.

Yu Haibin, deputy director of the Office of China National Narcotics Control Commission, said the US was "hyping" the flow of Chinese chemicals to Mexico. Photo: AP alt=Yu Haibin, deputy director of the Office of China National Narcotics Control Commission, said the US was "hyping" the flow of Chinese chemicals to Mexico. Photo: AP>