On the 9th of May, as Vladimir Putin stood at a podium on Red Square to address television viewers from Kaliningrad to Sakhalin Island, Russians and Ukrainians in Vienna were busy battling over the history of "Victory Day." In the shadow of the Austrian capital's enormous Soviet-era World War II monument, pro-Russian revelers slipped through police cordons to lay flowers at the foot of the statue, while pro-Ukrainian protesters on the opposite end of the Schwarzenbergplatz square unfurled a banner reading "Russland = Terrorstaat." "Before 2022, I didn't have any strong feelings about May 9 one way or the other,"...