Hackers hit Moscow internet provider in response to Kyivstar cyber attack, ET Telecom
Kyivstar: The hacking group, dubbed "Blackjack", has previously been linked to the Security Service of Ukraine (SBU). The hackers deleted 20 terrabytes of data at M9 Telecom, a small Russian internet and TV provider, leaving some Moscow residents without internet, the source said.
Source: indiatimes.com