More than three weeks ago, a popular Twitter account named “Anonymous” declared that the shadowy activist group was waging a
“cyber war” against Russia. Since then, the account — which has more than 7.9 million followers, with some 500,000 gained since Russia’s invasion of Ukraine — has claimed responsibility for disabling prominent Russian government, news, and corporate websites and leaking data from entities such as Roskomnadzor, the federal agency responsible for censoring Russian media.