You're reading: Voice of America: Russia’s digital weapons refined on virtual battlefield’ of Ukraine

It was a Friday in June, a short workday before a public holiday weekend in Ukraine, and cybersecurity expert Victor Zhora had left the capital, Kyiv, and was in the western city of Lviv when he got the first in a torrent of phone calls from frantic clients.

His clients’ networks were being crippled by ransomware known as Petya, a malicious software that locks up infected computers and data. But this ransomware was a variant of an older one and wasn’t designed to extort money — the goal of the virus’ designers was massive disruption to Ukraine’s economy.

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