Here is the report (pdf)

Individuals affiliated with RT - formerly Russia Today - leveraged “Meliorator,” an artificial intelligence (AI) enhanced software package which allowed for the creation of authentic appearing fictitious personas to post content on X. The tool also allowed for the management of the persona profiles through an administrator panel called “Brigadir” and the spreading of disinformation through these profiles through a seeding tool called “Taras.”

Affiliates of RT, a Russian state-sponsored media organization, used this tool to create fictitious online personas, representing a number of nationalities, to post content on a social media platform.

The report is joint effort of security agencies in the U.S., Canada, and the Netherlands.