Ukraine’s largest mobile operator, Kyivstar, said it had come under a powerful cyberattack on Tuesday that knocked out service and affected internet access for millions of people. The country relies on phone alerts to warn of close Russian bombardments.

Huge Cyberattack Knocks Ukraine’s Largest Mobile Operator Offline

The interruption could pose real danger in a country where many rely on phone alerts to warn them of impending Russian bombardments.

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