Saturday on PBS News Weekend, at the Munich Security Conference, Ukrainian President Zelenskyy says his country likely won’t survive its war with Russia without U.S. support. Then, the untold stories of millions of Africans lost at sea on the journey to the Americas, and one woman’s quest to document those lost slave ships. Plus, why winter swimming has gained a following around the world. PBS News is supported by - https://www.pbs.org/newshour/about/funders