Tonight on Amanpour and Company: An exclusive interview with Jens Stoltenberg, NATO Secretary General; Oksana Markarova, Ukrainian Ambassador to the U.S.; Matthew Chance, CNN Senior International Correspondent; Adm. Mike Mullen (Ret.), Former Joint Chiefs Chairman & Richard Shirreff, Former Deputy Supreme Allied Commander Europe. Walter Isaacson interviews Garry Kasparov, Chairman, The Human Rights Foundation.