Russian TV channels appear to have been hacked to broadcast Ukrainian songs, according to reports.
All of the Russia's government webpages are also down including the official website of the Kremlin - the office of Russian President Vladimir Putin - kremlin.ru, following reports of cyberattacks on various other state media websites.
In a chilling video message posted online by the hacker collective called Anonymous, a member of the masked group speaks directly to Putin.
As reported by The Mirror, they call on him to resign and restore the rights of the Ukrainian people.
The message, read out in English, with Russian subtitles reads: "Greetings Russian President Vladimir Putin.
"We have been patently waiting for you to respond to our most recent request, but we find ourselves growing impatient of your foot dragging.
"Unfortunately it seems you have made the option to ignore our presence and therefore we have decided to dedicate and operation specifically for you.
"A present of sorts."
He then goes on to name other times the group has taken websites offline.
He adds: "Your recent attempt to threaten Finland and Sweden is shameful.
"You threaten to invade those countries if they join NATO.
"We took down the websites of the federal anti-monopoly service, Kremlin, Russia Today and many other Russian government associated websites.
"Vladimir Putin is it a coincidence? Anonymous thinks not."
The electronic voice goes on: "From the depths of your closet, no skeleton will be left unturned.
"We are now asking for you to restore the rights of the Ukrainian people and resign as an elected official."
Anonymous also tweeted: " #Anonymous is at war with Russia.
"Stay tuned. #OpRussia #StopRussia #OpKremlin #FreeUkraine "
Messages threatening to place bombs at Moscow's train stations and airports have also been received by the authorities and checks are being made, the RIA news agency has reported.
It also said that the Russian embassy in London was in touch with British police after receiving phone threats related to Russia's invasion of Ukraine, which Moscow had described as a "special military operation."
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