China's foreign minister said on Friday the country will "resolutely counter" pressure from the United States on the fentanyl issue, adding that major powers "should not bully the weak", in a veiled swipe at Washington.

Spokane Police Chief Kevin Hall told the U.S. Senate on Wednesday that the economic toll of fentanyl is staggering as China smuggles precursors into Mexico for the cartels to ship north. His testimony followed a news release Tuesday from the Centers for Disease Control and Prevention,

China warned on Friday it will "resolutely counter" pressure from the United States on the fentanyl issue, after Washington levied an additional 10% tariffs on Chinese imports this week. "The abuse of fentanyl is an issue that the U.

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."

The White House announced on Monday that it will impose increased tariffs on China, citing the ongoing fentanyl crisis in the U.S. as the driving force behind the move.

A lack of trust and the whack-a-mole nature of stamping out the chemicals used to make the drug help explain why the war against fentanyl has been so intractable.