Ottawa, Canada - Canada's retaliatory tariffs on billions of dollars in US products took effect on Tuesday, as President Donald Trump's trade war with Ottawa continues to escalate.

The announced duties of 15%, 25%, and 50% apply to $20 billion in imports from the US, covering steel and aluminum products as well as dairy goods like cheese. Canada has, however, removed some seafood products from the initial list.

Ottawa's new tariff regime comes weeks after Trump imposed 50% tariffs on a range of Canadian products after trade negotiations broke down between the two neighbors.

Washington justified the levies as a response to "discriminatory treatment" against US alcohol, automobile, and dairy industries.

Mexico Sheinbaum declares Mexico "will not be a colony" of the US in response to Trump threat

The US tariffs hit items like hockey sticks and cement, impacting about 5.5% of Canadian exports to the US.

On Monday, Trump threatened to block sales of Canada's Bombardier Aviation in the US unless the Quebec-based plane maker moves manufacturing to the US.

"No more selling Bombardier in the United States!" Trump posted in all caps on Truth Social, though he did not specify how he would achieve a sales halt. Thousands of Bombardier aircraft currently operate in US airlines' domestic fleets.

US tariffs pose a modestly negative risk to Canada's overall economy, but analysts note that they have a sharper impact on Central Canada's manufacturing sector.

Carney has said that his government walked away from negotiations because the Trump administration's terms were ultimately unacceptable, particularly because US negotiators had at the last minute introduced restrictions on Canadian trade deals with other countries.

US officials also made unacceptable "threats" to the French language and "Quebec culture," he added, referencing the French-speaking province in eastern Canada.