Russian hackers were inside Ukrainian telecoms giant Kyivstar's system from at least May last year in a cyberattack that should serve as a "big warning" to the West, Ukraine's cyberespionage chief told Reuters. The hack, one of the most dramatic since Russia's full-scale invasion nearly two years ago, knocked out services provided by Ukraine's biggest telecoms operator for some 24 million users for days from December 12. In an interview, Illya Vityuk, the head of the Security Service of Ukraine's (SBU) cybersecurity department, said the hack caused "disastrous" destruction and aimed to land a psychological blow and gather intelligence.
Russian Hackers Were Inside Ukraine Telecoms Giant For Months, Says Cyberespionage Chief
Illya Vityuk heads the cybersecurity department of Ukraine's SBU state security service. (file photo)