The official website of the Kremlin, the office of Russian President Vladimir Putin, kremlin.ru, was down on Saturday after a cyberwar was declared on Moscow.
The websites were down after Ukraine's vice prime minister said it had launched an 'IT army' to combat Russia in cyberspace. The outage follows reports of denial of service (DDoS) attacks on various other Russian government and state media websites.
On Wednesday, a newly discovered piece of destructive software was found circulating in Ukraine that impacted hundreds of computers, according to researchers at the cybersecurity firm ESET.
Meanwhile, 'Anonymous,' a cyber hacker group, declared a "cyberwar" against Putin's administration as it launched a full-scale invasion of Kyiv amid the continuing Russia-Ukraine conflict.
International media reported that the hacking group aims to deactivate several Russian government websites.
A social media account purporting to represent the group wrote on Thursday that "The Anonymous collective is officially in cyberwar against the Russian government."
The "Anonymous collective has taken down the website of the Russian propaganda channel RT News," it added, confirming the RT.com hack.