How has the relationship with the United States and Putin changed from president to president? When did the relationship sour and what, if anything, could have been done to send warning signals to Putin? Host: Ned Sedgwick  Guests: Dr Leslie Vinjamuri (Director, US and the Americas Programme Chatham House), Dr. Kupchan is Professor of International Affairs at Georgetown University, former Senior Advisor to President Obama)  This episode was produced by David Dargahi of on behalf of .