Ukrainians have reminded us what freedom means -- a word that for many in rich democracies had long ago curdled into platitudes. The resilience of the population has impressed the West and surprised the Kremlin. It shouldn't have. For the past few years I've been trying to unlock the secret of Ukrainian identity by talking to Ukrainians. Through my research project, Arena, based originally at the LSE and now at Johns Hopkins University, I've worked with Ukrainian journalists and sociologists to find ways of strengthening democracy. My team has interviewed thousands of adults across the country. Our fieldwork shows that the response to Russia's invasion has deep roots in Ukrainian history.