The U.S. Commerce Department on Wednesday finalized steep anti-subsidy duties on Bombardier Inc.'s CSeries jets, setting up the next round of a fierce international trade dispute between the United States and Canada.

The move announced by the department to impose duties of nearly 300 percent stems from a complaint by rival Boeing Co. that Bombardier had been unfairly and illegally subsidized by the Canadian government, allowing the plane maker to dump its newest jetliner in the U.S. market below cost.

"Today's decision validates Boeing's complaints regarding Bombardier's pricing in the United States, pricing that has harmed our workforce and U.S. industry," Boeing said in a statement after the department decision.