When people speak of the Great Game, they usually mean the 19th-century rivalry between the British and Russian empires for influence over Central Asia. It conjures up images of spies crossing deserts, mountain fortresses and imperial intrigue – an era vividly brought to life in Peter Hopkirk’s books, which first awakened my fascination with the region.A century and a half after the Great Game, another contest is unfolding across the same region. To the north is Russia, the region’s traditional...