Russian smart TV owners saw an anti-war message on Victory Day.
"The blood of thousands of Ukrainians and hundreds of their murdered children is on your hands," began the message shown to Russian viewers, Mediazona reported. "TV and the authorities are lying. No war."
The Russian outlet added that authorities believed someone hacked the TV systems to display the message to viewers of Channel One, Rossiya-1, MTS TV, NTV-plus, Rostelecom, and the Winx media player.
Pro-Moscow news site Gazeta.ru also reported the hack on Twitter.
"Tonight, TV viewers saw provocative anti-war messages instead of the program guide and channel descriptions on their TVs," a tweet from Gazeta.ru said. "MTS, Rostelecom and NTV-Plus, as well as the Yandex TV program, were attacked by hackers."
The May 9 Victory Day parade in Moscow's Red Square marks the anniversary of the Soviet Union's victory over Nazi Germany in World War II.
The Kremlin approved RuTube, a Russian version of YouTube, was unavailable after being subjected to a "powerful cyberattack," the platform's Telegram channel reported.
RuTube representatives said they would update users on when the service would be restored.
The anti-war message appeared on the Yandex.Teleprogram service but was removed quickly.
Also, there were reports of a revolt by employees at the Kremlin-approved Lenta.ru news website.
More than 10 since-deleted items criticizing President Vladimir Putin and the war in Ukraine appeared on the website.
"These were news item with the headlines 'Putin unleashed one of the bloody wars of the 21st century,' 'Vladimir Putin has turned into a pitiful dictator and paranoiac,' 'The Russian elite is ill with nepotism and sycophancy,' as well as the article 'War makes it easier to cover up failures in the economy. Putin must go. He unleashed a senseless war and is leading Russia into the abyss,'" Mediazona reported.
Putin on Monday evoked the memory of Soviet heroism in World War II to inspire his army fighting in Ukraine, but offered no new road map to victory and acknowledged the cost in Russian soldiers' lives.
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