European Parliament President Roberta Metsola said that a pro-Kremlin hacker group has claimed responsibility for a hacking attack targeting the European Parliament's website.

It stated that the parliament's website was blocked for about two hours on Wednesday after its members classified Russia as a "state sponsor of terrorism".

"The European Parliament is under a complex cyberattack," Metsola wrote on Twitter. "Our IT experts are repelling the attack and protecting our systems."

And she went on to say, "This happened after we declared that Russia is a state sponsor of terrorism. My response is: Glory to Ukraine," as she put it.

The outage was caused by a denial-of-service attack by directing large amounts of internet traffic toward the target servers in a relatively uncomplicated effort by hacktifists to make them unavailable on the network. Such attacks do not usually cause much damage.

These attacks are known as denial-of-service attacks, and hackers work during denial-of-service attacks to overwhelm the target network servers with a torrent of data requests to paralyze.

And the deputies voted earlier yesterday in favor of classifying Russia as a "state sponsor of terrorism", and stressed that the attacks launched by Moscow on civilian targets such as energy infrastructure, hospitals, schools and shelters violate international law.