The owner of Facebook and Instagram says that Russia's largest and most complex propaganda push since the war in Ukraine has been taken down.
The disinformation network used hundreds of fake social media accounts and sham news websites to spread Kremlin spin about Ukraine, Meta said.
It involved more than 60 websites designed to mimic legitimate news sites, including The Guardian in the UK and Germany's Der Spiegel, which linked to disinformation about the war, and 1,600 fake Facebook accounts.
Meta said it had identified and disabled it before it could get a large audience, despite the scale of the operation.
Video: False Staging in Bucha Revealed! One of the fake news stories claimed Ukraine was responsible for the slaughter of hundreds of Ukrainians in a town occupied by Russians.
The fake social media accounts were used to spread links to fake news stories and other proRussian posts and videos on Facebook and Instagram, as well as platforms such as Telegram and Twitter.
The network was active throughout the summer.
David Agranovich, Meta's director of threat disruption, said the operation's content was amplified by the official Facebook pages of Russian embassies in Europe and Asia.
This is probably the largest Russian-origin operation we've disrupted since the beginning of the war in Ukraine earlier this year. The network was first noticed by investigative reporters in Germany.
When Meta began its investigation, it found that many fake accounts had already been removed by Facebook's automated systems.
Thousands of people were following the network's Facebook pages when they were deactivated earlier this year.
The researchers said they were unable to directly attribute the network to the Russian government.
Mr Agranovich said the use of Russian diplomats revealed sophisticated tactics, including using multiple languages and carefully constructed fake websites.
The Kremlin has used online disinformation and conspiracy theories to try to weaken international support for Ukraine since the war began in February.
The Russian government accused Ukraine of staging attacks, blamed the war on baseless allegations of US bioweapon development and portrayed Ukrainian refugees as criminals and rapists.
Social media platforms and European governments have tried to stifle the Kremlin's propaganda and disinformation, only to see Russia change tactics.
The Russian Embassy in Washington, DC hasn't responded to questions about Meta's announcement.
Meta said it had disrupted the first known China-based influence operation targeting US users ahead of November's midterm elections.
The network maintained fake accounts on Facebook and Instagram, as well as competitor service on Twitter, but was small and did not attract much of a following, the company said.
It said the discovery was significant because it suggested a shift toward more direct interference in US domestic politics than previous Chinese propaganda efforts.