https://newtimes.ru/articles/detail/202826?fcc
https://www.ng.ru/ng_energiya/2021-04-12/9_8126_partnership.html
https://foreignpolicy.com/2021/04/09/sanctions-wont-stop-nord-stream-2-diplomacy-will/
https://www.mk.ru/economics/2021/04/09/rossiya-vstupila-v-borbu-s-uglerodnym-nalogom-es.html
https://newizv.ru/news/society/09-04-2021/kachestvo-rossiyskoy-nefti-prodolzhaet-snizhatsya
https://www.kp.ru/daily/27262/4395008/