On Thursday, several key Ukrainian government agencies reported cyberattacks on their systems, and a source close to the government told Reuters that Russian intelligence was behind it.

Ukraine’s state-owned energy company Naftogaz has announced a “large-scale cyber attack” on one of its data centers, “currently our websites and call center are unavailable,” according to a Telegram message.

The National Postal Service of Ukraine “Ukrposhta” has reported a “significant technical failure” in its IT systems. “Last night there was an attack on the IT infrastructure of our partners,” said the head of Ukrposhta Ihor Smilyanskyi.

The state transport security service “Ukrtransbezpeka”, which manages the border crossing system for Ukrainian drivers, also reported problems with the data center.

The conference center and the ticketing system of the state railways of Ukraine also reported suspicions of cyber attacks.

A source close to the Ukrainian government said there are other “victims”, mainly in the financial and banking sectors, but government policy is to disclose only those whose services have declined.

A Reuters source said the culprits had not yet been identified, but the attacks were “not too serious” compared to the major attack on Kyivstar, Ukraine’s largest mobile operator.

“Ukraine is moving very quickly to restore the systems. It usually takes a few days,” the source said, adding that the attackers were “almost certainly” hackers linked to Russia’s FSB intelligence service.

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