OTTAWA — The United States announced Tuesday that it would impose duties on imports of a new jet made by the Canadian jet maker Bombardier, a decision likely to fuel trade tensions between the United States and Canada just as the two countries face off over the future of the North American Free Trade Agreement.

In response to a trade case filed by the American jet maker Boeing, the United States Commerce Department ruled that Bombardier’s CSeries aircraft, a smaller, regional aircraft that entered service last year, had received subsidies of 219.63 percent of the plane’s sales price, and it said it would begin collecting duties equivalent to that amount.

That will more than triple the price of the new jet, chilling Bombardier’s future sales and potentially giving Boeing more space to expand into the market for smaller aircraft.

“The U.S. values its relationships with Canada, but even our closest allies must play by the rules,” Wilbur Ross, the secretary of commerce, said in a statement.