Major Moscow internet service provider M9com was claimed to be compromised by pro-Ukrainian hacking operation Blackjack in retaliation for Russia's attack against Kyivstar, Ukraine's largest telecommunications firm, last month, according to The Record, a news site by cybersecurity firm Recorded Future.
Article Link: https://www.scmagazine.com/brief/russian-isp-targeted-by-pro-ukrainian-hackers-as-payback-for-kyivstar-attack