Ukrainian hackers have "congratulated" Putin on his birthday by carrying out a large-scale attack on the All-Russia State Television and Radio Broadcasting Company (VGTRK). A well-informed source in Ukraine's law enforcement agencies told this to Ukrinform.

"The main propaganda TV channels stopped broadcasting online from the very morning: Rossiya 1, Rossiya 24, Rossiya Culture, RTR Planeta and more than 20 others. As far as we know, not only the online broadcasting of these TV channels does not work in the swamps, but also the television one," the source said.

He added that employees of the Russian company complain that "all information on the servers, even backup copies, has been destroyed, online broadcasting and internal services do not work, there is no internet and telephony."

The anonymous pro-Ukrainian hacker group Sudo rm-RF, which has repeatedly "attacked" the Russian Federation, has claimed responsibility for the attack.