https://carnegie.ru/commentary/85343
http://altanalyses.org/en/2021/09/13/ever-greater-failure-eu-energy-policy/
http://www.kasparov.ru/material.php?id=613DE9DC53835
https://www.kommersant.ru/doc/4978146
https://www.bbc.com/russian/features-58508091
https://www.nytimes.com/2021/09/09/us/politics/russia-ransomware-hackers.html