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A police officer walks at the site of a bombing that damaged residential buildings in Kyiv, Ukraine, Friday, March 18, 2022. Russian forces pressed their assault on Ukrainian cities Friday, with new missile strikes and shelling on the edges of the capital Kyiv and the western city of Lviv, as world leaders pushed for an investigation of the Kremlin’s repeated attacks on civilian targets, including schools, hospitals and residential areas.

A police officer walks at the site of a bombing that damaged residential buildings in Kyiv, Ukraine, Friday, March 18, 2022. Russian forces pressed their assault on Ukrainian cities Friday, with new missile strikes and shelling on the edges of the capital Kyiv and the western city of Lviv, as world leaders pushed for an investigation of the Kremlin’s repeated attacks on civilian targets, including schools, hospitals and residential areas. (Felipe Dana/AP)

Russian cyber attacks have so far struggled to successfully target Ukraine’s critical national infrastructure, according to government officials.

While they are aware of Russian intent to disrupt or infiltrate Ukrainian systems, according to the officials, they have continued to function and Ukraine has mounted a strong defense.

Many denial-of-service attacks targeting Ukraine are of low sophistication and impact, the people said, who asked not to be identified discussing private information. The country’s experience fending off major cyber attacks since 2015 may have helped prepare it for recent attempts, they added.

The destructive “wiper” malware seen in Ukraine is more insidious and the officials said they are on alert for it appearing outside of the country. In the hours prior to Russia’s invasion, some Ukrainian government agencies were targeted with the software, which deleted data held on infected computers.

More aggressive network take-downs or attacks may not fit with Russian objectives, they added, and Russia could even be leaving the broadband network active for its own means to gather intelligence.

Over 400,000 people have volunteered to help the Ukrainian government, using digital means to disrupt Russian government and military targets, according to a Ukrainian cybersecurity official.

Although cyber attacks within Ukraine have had mixed success, there have been significant attacks on other targets. U.S., French and Ukrainian intelligence agencies are investigating an apparent cyber attack against ViaSat Inc., according to a report from Reuters.

The U.K. is now also investigating the attack, according to people familiar with the situation.

It’s one of the highest profile cyber incidents seen during the Russian invasion of Ukraine, and could be “spillover” from the conflict, said the officials, who asked not to be named discussing confidential matters.

It is not known whether the hack is attributed to Russian activity.

ViaSat previously said they believed a partial network outage affecting customers in Ukraine was “caused by a cyber event.” Representatives for the California-based company didn’t immediately respond to a request for comment outside of ordinary business hours.

French internet provider Nordnet also said that the incident had disrupted some of its services.

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