Timothy Snyder, the Richard C. Levin Professor of History at Yale University, is a renowned expert on the history of Central and Eastern Europe. He is teaching a class on the history of Ukraine at Yale, which he has kindly made available as an open educational resource. You can find the syllabus here and follow the lectures on Youtube here. He has also written an article on “Ukraine Holds the Future: The War Between Democracy and Nihilism” for Foreign Affairs – worth reading.