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Ukraine ’s largest telecommunications hustler Kyivstar says it has been hit by a “ powerful ” cyberattack that has disrupted headphone and internet service for millions of multitude across the country .

Officials in the northern Ukrainian city of Sumy also monish that its strain raid qui vive organization was also affected by the Kyivstar outage . “ The notification system will temporarily not operate , ” consort toa instruction by Sumy ’s regional military administrationposted to Telegram .

Kyivstar CEO Oleksandr Komarov said ina television statementthat Russia was responsible for for the outage . “ The warfare with the Russian Federation has many dimensions , and one of them is in cyberspace , ” say Komarov . “ unluckily , this morning time the operator became the objective of a super - powerful cyberattack , because of which communications services and internet access are unavailable . ”

When asked whether it believe Russia was behind the attack , a voice for Ukraine ’s State Special Communications Service , or SSSCIP , secern TechCrunch that “ it is too other to draw conclusions . ”

“ The investigation of the incident , which caused a technical loser in the operator ’s work , as a result of which communication and internet access code service are temporarily unavailable , is on-going by specialists of the relevant military service , ” the SSSCIP spokesperson , who did not offer a name , added . “ Among others , specialists of the Government Computer Emergency Response Team CERT - UA are involved in this employment . ”

Kyivstar spokesperson Iryna Lelichenko was not immediately available to respond TechCrunch ’s questions .

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In his picture statement , Oleksandr tot up that “ it is still not completely clear ” when the telecoms colossus will restore normal operations . Netherlands - base VEON , Kyivstar ’s parent company , said in a statementits technological team are “ working on eliminating the outcome of the hacker attack and restoring communicating as shortly as potential . ”

Kyivstar apologized for the “ temporary incommodiousness ” and promised to correct users who were affected by the outage , but enunciate that the personal data of ratifier had not been compromised . “ Yes , our enemies are treacherous . But we are ready to face any difficulties , overcome them and continue to work for Ukrainians , ” the company added .

At the same fourth dimension that Kyivstar come under attack , Monobank , one of Ukraine ’s turgid fiscal institutions , said it had also been targeted by hackers . The bank ’s co - founder Oleh Gorokhovskysaid in a Emily Post on Telegramthat the establishment had been struck by a “ monumental DDoS ” attack , consult to cyberattacks that involve flowage of junk internet dealings aimed at downing online site and Robert William Service , but add that “ everything is under control . ”

Ukraine detains Victor Zhora , former top government cyber official