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Russia is attacking the U.S. energy grid, nuclear facilities, water processing plants, aviation systems, and other critical infrastructure that millions of Americans rely on, according to a new joint analysis by the FBI and the Department of Homeland Security. The new attribution—the first official confirmation by the U.S. of Russia’s effort—includes an accusation that the Kremlin was behind a group of sophisticated hackers known as “Dragonfly” that had penetrated energy company systems last year in ways that could be used to sabotage the U.S. electric grid.