NATO's Secretary General joins Christiane for an exclusive interview, followed by Ukrainian Ambassador to the US Oksana Markarova. CNN correspondent Matthew Chance then joins from Kyiv where he encountered Russian forces just outside the capital city. Today's show also features military analysis from former Joint Chiefs Chairman Adm. Mike Mullen and Richard Shirreff, the former Deputy Supreme Allied Commander Europe. It closes with Garry Kasparov, the former Russian champion who now chairs the Human Rights Foundation. To learn more about how CNN protects listener privacy, visit cnn.com/privacy