we've heard from the cranium president vladimir lance. he his bow that those behind the slaughter of ukrainians must be brought to justice. and the one person we're all looking at and wondering about is vladimir putin. he's the one sitting in moscow giving the orders . but what kind of evidence is required to link him to the crimes being committed in ukraine today? so again, that, that's the challenge to am, to find the evidence that will link him said to link that of events through the chain of command. so i'm someone in that position of a rather remote perpetrate potential and perpetrator who is not physically there and sort of involved in events on the ground. so it's necessary to find the evidence to, to build up that, to that link. because there are different ways of doing that. the different modes of liability to, to hold perpetrators to, to account. so it, it could involve, and the notion such as a known as a command responsibility of superior responsibility and where someone can be held to account for failing to prevent or punish t

lance, europe between hitler and stalin. tim snider has been studying authoritarianism for years. we need something to say about the war in ukraine, i listen. not a row today that vladimirukrainian people but at great cost the russia. in his piece titled, by denying a ukrainian culture, putin flattens his own, center-right's quote, vladimir putin wants to crush people into one. he says got told him that ukrainian souls are russian. history revealed to him that ukrainian strives to be one with russia, the very language he speaks and titles him to invade any country where russian is spoken. an official russia new service removed any ambiguity a few days ago, publishing a text advocating the complete elimination of the ukrainian nation as such. and so, ukraine must be crushed, and anyone that thinks or speaks of ukraine must be eliminated. and quote. joining me now is professor timothy snyder at yale university. thank you for being with us tonight. we talked earlier tonight about how russia is using propaganda and disinformation. your piece today focuses on what this war is doing to russian culture and identity. i would love if you could tell us a bit about that. >> the ce