Over nearly a decade, the hacker group within Russia’s GRU military intelligence agency known as Sandworm has launched some of the most disruptive cyberattacks in history against Ukraine’s power grids, financial system, media, and government agencies. Signs now point to that same usual suspect being responsible for sabotaging a major mobile provider for the country, cutting off communications for millions, and even temporarily sabotaging the air raid warning system in the capital of Kyiv.

Source: Wired – Threat Level