The U.S. president says he will impose tariffs on Canada and Mexico starting tomorrow. Canada is trying to prepare. Ottawa says there are countermeasures ready and waiting, depending on what Donald Trump actually does. That uncertainty is causing stress for businesses waiting to see what happens. We have a story from Windsor, Ontario – home to major auto assembly plants. Full tariffs could mean mass layoffs by the end of the week. Workers there say they are anxious about what comes next.

And: Picking up the pieces of the Trump-Zelenskyy relationship. Ukraine’s president Volodymyr Zelenskyy is leaning on Europe, which is trying to form “a coalition of the willing” to protect his country.

Also: Who owns Antarctica? The short answer: no one. But the long-term answer could get more complicated, as countries eye fishing and mineral access to the continent. Does it need more protection?

Plus: Ontario changes screen protocol for cervical cancer, Trudeau meets King Charles and more.