Finland’s President Sauli Niinistö has known Vladimir Putin for a decade and is among a handful of world leaders who continue to call the Russian president, trying to stop the war. Christiane speaks with him in London to get a sense of what might be Putin’s endgame. Next, Christiane discusses the growing humanitarian crisis in Ukraine with the UN's emergency relief coordinator Martin Griffiths. Also in today's episode: Correspondent Jim Sciutto reports on the thousands of foreigners who've answered President Zelensky’s call for a foreign legion to help repel the Russian invaders. And, Michel Martin interviews veteran war crimes investigator David Scheffer to evaluate the chances of convicting Putin and his henchmen.To learn more about how CNN protects listener privacy, visit cnn.com/privacyLearn more about your ad choices. Visit podcastchoices.com/adchoices