China said it has forcefully cracked down on the fentanyl trade and condemned President Donald Trump’s tariffs, as the world’s two largest economies remain at odds over the conditions for any talks to cool tensions.

The U.S., where fentanyl abuse has been a major cause of death, has pushed China for deeper law enforcement cooperation, including tackling illicit finance, arrests of rogue chemists and raids of labs involved in the production of precursors.

Canadian and Chinese officials say they were already helping reduce fentanyl smuggling. Prime Minister Justin Trudeau said fentanyl crossing the northern border is "near zero."