A cyberattack that knocked Ukraine’s biggest mobile network operator offline has been claimed by a hacking group believed to be affiliated with Russian military intelligence, Ukraine's cyber defence agency said on Wednesday. Tuesday’s attack on Kyivstar, which has 24.3 million mobile subscribers and more than 1.1 million home internet users, knocked out services, damaged IT infrastructure, and silenced air raid alert systems in some parts of Ukraine. A group of activist hackers, or "hacktivists", called Solntsepyok said in a post on the Telegram messaging app that it carried out the cyberattack, and published screenshots appearing to show that the hackers had accessed Kyivstar’s servers.
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