A major cyberattack brought down key services for millions of Ukrainians on Tuesday after hackers targeted the country's largest mobile operator, Kyivstar. Without telephone or internet access, subscribers reported disruptions to banking services through ATMs as well as public transportation payment systems and business equipment operations.

The carrier later confirmed that the cause of the failure was a powerful hacker attack.

LIGA.net spoke with experts, Ukraine's Security Service (SBU) and the State Special Communications Service to find out the reasons for the cyber attack.

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