Since the Russian military agency known as the GRU first entered the spotlight as the hackers that targeted the 2016 US election, it’s become increasingly known as the actor behind much of the Kremlin’s most brazen digital behavior. It’s responsible for everything from the first-ever blackout triggered by hackers—turning off the power to a quarter million Ukrainians in December 2015—to NotPetya, the worst cyberattack in history, a worm that inflicted $10 billion in damage.

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