After eight years of civil war in the Donbas triggered by the US-backed, far-right-led Maidan coup and fueled by US weapons, Ukraine is now under a catastrophic Russian assault. Scholar Nicolai Petro on the tragedy of Ukraine. Guest: Nicolai Petro. Professor of political science at the University of Rhode Island, editor of "Ukraine in Crisis," and the author of the forthcoming "The Tragedy of Ukraine." He is also a member of the board of the American Committee for U.S.-Russia Accord.