A moment of silence in Kyiv today as Ukrainians mark a grim milestone: four years of war, with hundreds of thousands killed and many more wounded. Now, President Zelensky is doing everything in his power to convince his allies to stick with Ukraine. Journalist Nataliya Gumenyuk joins the show from Kyiv where she's been asking people how they feel about the war, four years on. 

Also on today's show: Michael Kofman, Senior Fellow, Carnegie Endowment for International Peace; Craig Renaud, director of the new documentary "Armed Only with a Camera" about his journalist brother's killing in Ukraine; cognitive scientist Maya Shankar, author of "The Other Side of Change"