Ursula von der Leyen, president of the European Commission, left, with Justin Trudeau, Canada’s prime minister, on Parliament Hill in Ottawa, Canada in 2023. The European Union and Canada on Wednesday promptly retaliated against Donald Trump’s latest tariff volleys, escalating his now-global trade war.

Canada is imposing, as of 12:01 a.m. Thursday 25% reciprocal tariffs on steel products worth $12.6 billion Canadian (US$8.7 billion) and aluminum products worth $3 billion Canadian (US$2 billion) as well as additional imported U.S. goods worth $14.2 billion Canadian ($9.9 billion) for a total of $29.8 billion (US$20.6 billion.)