https://www.vice.com/en_us/article/4ax459/pro-ukraine-hacktivists-claim-to-have-hacked-notorious-russian-mercenary-group

A decentralized volunteer group of hackers who support Ukraine claimed to have hacked the notorious Russian mercenary group Wagner on Monday. 

The Ukraine IT Army posted a message on its official Telegram channel, claiming to have stolen the personal data of the group’s mercenaries from one of its websites.