“In the opening movements, the T-80 and T-90A tanks maneuver to techno music. There is a brief tango interlude. For the classical portion, the Russian arms company enlisted a ballet director from the Bolshoi Theater, Andrei Melanin. … The Russian tanker crews seem to coax their machines into delicate, even coquettish advances on other tanks. … At one point, two tanks twirl in a creaky, diesel-smoke-belching embrace.”