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.

China will impose additional tariffs of up to 15% on some U.S. goods, its government said, while Canada vowed tariffs of up to 25% after new U.S. tariffs on both countries took effect.

Canadian Prime Minister Justin Trudeau announced late Monday night that Canada “will respond with 25 per cent tariffs against $155 billion of American goods” as a result of Trump’s action.

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.

Mounting trade wars between the United States and its largest economic partners deepened on Tuesday as US tariffs on Canada, Mexico and China kicked in, sparking swift retaliation from Beijing and Ottawa.

China and Hong Kong stocks slipped on Tuesday, as new U.S. tariffs on Chinese imports were set to take effect, while investors awaited the upcoming annual parliamentary sessions to gauge Beijing's policy path.