Anti-war messages appeared in Russia across televisions and search engines, after a hack targeted Russians watching TV or searching things on the internet.
The anti-war message said: "The blood of thousands of Ukrainians and hundreds of murdered children is on your hands. TV and the authorities are lying, no to war."
The Washington Post reported the hack occurred during pro-Moscow messaging on Monday (local time) as Russia celebrated 'Victory Day', a commemoration of the Soviet Union's role in defeating Nazi Germany during World War II.
Russian troops gathered in Moscow's Red Square to celebrate Victory Day and listen to President Vladimir Putin give a speech on the Ukraine invasion, claiming NATO and western countries provoked Russia.
The Russian equivalent of YouTube known as RuTube was also hacked.
"Following the sites of various Russian ministries, which have been constantly subjected to cyberattacks over the past two months, hackers have reached RUTUBE," RuTube said on its official Telegram channel.
"Our video hosting has undergone a powerful cyberattack. At the moment, it is not possible to access the platform."
The Washington Post reported that the streaming platform said it had "localized the incident" and was working to restore it back to normal.
The Russian government websites and the state-run media outlets have received an "unprecedented" wave of attacks since Russia invaded Ukraine on February 24, The Washington Post reported.
The Washington Post also reported that in March, Russia's ministry of digital development and communications said the attacks were at least twice as powerful as any previous ones, prompting the agency to enact unspecified measures to protect the services.
