Ivano-Frankivsk was supposed to be far from the Russian front. The city and province of the same name are on the far western side of Ukraine, away from the Russian-backed breakaway province of Donetsk in the east. Donetsk has seen almost two years of fighting on stalemated trenches. Yet last month, it was Ivano-Frankivsk that appears to have suffered from a new attack: malware, planted by hackers in several power stations, left hundreds of thousands without electricity in subzero conditions. Cyberwar, it seems, is an attack best served cold.