The bots were churning Russian propaganda justifying Tsar Putin’s war in Ukraine, disseminating illegal content and personal information, and various other fraudulent activities.

In a joint operation, the cyber police and units of the Ukrainian National Police executed 21 search operations in Vinnytsia, Zaporizhzhia, and Lvivand.

In a press release, the Ukrainian coppers said that the cyber police established that the attackers used special equipment and software to register thousands of bot accounts in various social networks and subsequently launch advertisements that violated Ukrainian law.

"In addition to spreading hostile propaganda, the accounts were also used for unauthorised distribution of personal data of Ukrainian citizens on the Internet, in Internet fraud schemes, and for sending known false messages about threats to citizens' safety, destruction or damage to property."

Cyber police in Ukraine have busted several pro-Russian bot farms in the last year, including one last month called "Botoferma" and another one late last year that was working for the Russian secret services.

Ukraine traced a Russian propaganda operation to a bot farm secretly operating in the country's capital of Kyiv last August. "The farm operated more than 1 million bot accounts, which helped the propaganda operation build an audience of over 400,000 users on social media."