https://www.kommersant.ru/doc/5065442
https://carnegie.ru/commentary/85732
HTTPS://WWW.KOMMERSANT.RU/DOC/5063490
https://www.radiosvoboda.org/a/rosiya-ne-vykorystovuye-haz-yak-zbroyu-vy-seryozno/31546995.html
https://jamestown.org/program/gazproms-italian-strike-or-the-latest-russian-blackmail-of-europe/