The United States has imposed a ban on selected imports from Canada, sharply escalating the trade confrontation between the two neighbours.

The restrictions target specific product categories and follow months of tariff threats from the Trump administration. Ottawa has condemned the move as unjustified and promised a firm response.

Canada is one of America’s largest trading partners, and the ban disrupts deeply integrated supply chains. Business groups on both sides of the border warned of higher costs for consumers and producers alike.

The move comes amid broader US efforts to use trade restrictions as leverage in negotiations. Analysts say the administration is pressuring Canada on issues ranging from dairy to defence spending commitments.

Canadian officials said they were consulting with provinces and industry before announcing countermeasures. The dispute adds to uncertainty for exporters already grappling with tariff volatility. Economists warn a prolonged standoff could slow growth in both economies and unsettle financial markets.