The UK National Cyber Security Centre report.

https://www.ncsc.gov.uk/news/uk-allies-uncover-russian-military-carrying-out-cyber-attacks-digital-sabotage

UK and allies uncover Russian military unit carrying out cyber attacks and digital sabotage for the first time
The NCSC and partners call out Russian GRU cyber actors Unit 29155 for campaign of malicious cyber activity since at least 2020.

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