The website of the Russian space agency Roscosmos has been subjected to a massive DDoS attack carried out from various IP addresses one more time, after the Anonymous hacker group's declaration of a cyberwar against Russia, the agency's press service said on Sunday.

"A massive DDoS attack from various IP addresses is being carried out on the website of Roscosmos. It is currently not available for visiting," a representative of the space agency told reporters.

First time the website stopped working on Friday. The message DB error! (Database Error) was displayed when visiting the website.

Biden’s administration has been considering interrupting internet connectivity across Russia, turning off the country's electrical power, and messing with train switches to obstruct Moscow's ability to replenish its military, according to NBC.

US President Joe Biden has been presented with a variety of cyberattack possibilities to deploy against Russia, according to sources familiar with the situation, but no final decision has been taken, the report added.

After the Donbass republics of Donetsk and Lugansk requested aid to defend themselves from continued attacks by Ukrainian troops, Russian President Vladimir Putin authorized a special military operation in Donbass.