Tatarstan and Bashkortostan. Two neighboring republics in the heart of Russia, sharing the fertile plains between the river Volga and the Ural Mountains. Each is fiercely proud of its language, its cuisine, its culture. And its hockey. When Kazan and Ufa, the capitals of the two republics, clash on the ice, it’s one of the biggest rivalries in Russian sport. This is the Green Derby, Ak Bars vs Salavat Yulaev.