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.

"A once in a generation moment" for Europe's security. That is how Britain's Prime Minister Kier Starmer is framing Sunday's summit, aimed at achieving peace in Ukraine. In attendance was Justin Trudeau along with the leaders of more than a dozen European countries. The summit was planned some time ago, but it's taking on added significance after Friday's tense meeting between Donald Trump and Volodymyr Zelenskyy.

Also: The White House is again sending mixed signals about its threatened tariffs. The U-S seems poised to impose the sweeping measure this Tuesday. But it's still unclear, if those tariffs will be as steep as originally planned.

And: Around this time next Sunday, the Liberal Party will elect its new leader. Voting is already underway, but a voting app that was supposed to make the process simpler and more secure is now causing issues.

Ukrainian president Volodymyr Zelenskyy is searching for calmer waters across the pond - one day after a heated confrontation with U.S. President Donald Trump and Vice President JD Vance in the Oval Office. By contrast, a meeting with Britain's Prime Minister Saturday was cordial and supportive. And comes just ahead of a European summit looking at Ukraine's future after three brutal years of war.

Also: A Canadian Navy vessel has reached Antarctica. Now, the team of scientists on board is getting down to work to better understand how climate change has altered the Southern Ocean. You'll hear from CBC's International Climate Correspondent, who's onboard the ship.

And: The Latvian animated movie 'Flow' could soon take home Oscar gold. Its the first movie from the Baltic country to ever be up for an Academy Award. We'll take you to Riga...where Latvians are celebrating the film as a source of national pride.