https://www.ng.ru/economics/2021-12-13/1_8325_gazprom.html
https://theins.ru/politika/247031
https://www.rosbalt.ru/world/2021/12/07/1934457.html
https://www.bbc.com/russian/features-59562776
https://www.rbc.ru/newspaper/2021/12/06/61aa3c879a7947e608b37485
https://www.ng.ru/economics/2021-12-06/1_8319_export.html
https://www.bbc.com/russian/news-59491511