The hackers cut short television footage of Russia's "Victory Day" parade as messages were sent accusing citizens of having "blood on their hands" for the war in Ukraine.

Censored Russian cable and satellite television stations suddenly broadcast anti-war messages shortly before Russian President Vladimir Putin delivered a speech in Moscow's Red Square,

"In your hands are the blood of thousands of Ukrainians and hundreds of dead children," read one of the slogans, adding that television and the authorities were lying.

"Not war."

A Russian news site also featured anti-war material that was deeply critical of Putin, which quickly disappeared.

Russian TV Hack?

'Blood On Your Hands' Anti-War Message Appears During Victory Day Programming.

"Blood of thousands of Ukrainians and hundreds of their murdered children" were on the hands of the viewer, adding the slogan, "no to war." Https://t.co/QWMXeaYTYn https://t.co/RtzLQOFILS

- Anonymous (@YourAnonNews) May 9, 2022

The secret cyber-vigilant group Anonymous - which previously targeted the Russian media - was one of those who distributed hacking videos on Russian television, without taking direct credit for it.

"Good morning Moscow," the hacker group wrote in Twitter in English and Russian.

Russian media have been horrified by pro-Kremlin coverage after a new law was passed at the start of the war that threatened journalists with 15 years in prison if they run counter to the government's official stance.

It forced many foreign media outlets to leave the country.

MTS, Russia's largest mobile network operator, confirmed that many of its channels, including NTV Plus, Rostelecom and Wink, were among those hacked.