As feared and anticipated, Vladimir Putin sent his troops over the border into Ukraine – an act of aggression and a blatant violation of international law. If Ukrainians, over the days ahead display courage, defiance, and determination, can they stop Putin from stripping them of their right to independence, sovereignty, and self-determination?

Having shown little will to contain Putin after he dismembered Georgia in 2008, or after he seized Crimea from Ukraine and annexed it in 2014, what can – and should – American and European leaders do now? And if Putin emerges victorious from this war, will that sate his appetite — or whet it?

Discussing these issues with Foreign Podicy host Cliff May are James Brooke, FDD visiting fellow who has lived in and covered Russia for The New York Times, Bloomberg, the Voice of America and other publications; Ivana Stradner, Jeane Kirkpatrick Visiting Research Fellow at the American Enterprise Institute; and John Hardie, research manager and research analyst at FDD.