In recent weeks, Russia has assembled tens of thousands of troops on its border with Ukraine, actions that led to a phone call on Dec. 7, 2021, between President Biden and Vladimir Putin about consequences should Russia plan any attack. On this episode of the Breaking Boundaries podcast, two former U.S. ambassadors weigh in on the current tensions and provide context and opinions on the current situation. Guests: Steven Pifer, a William J. Perry Research Fellow at the Center for Int...