https://focus.ua/opinions/387550/
http://day.kyiv.ua/ru/blog/politika/kto-i-skolko-poteryal-ot-sankciy
http://www.ng.ru/world/2017-12-21/6_7141_england.html
After the deal with OPEC, Russia’s energy minister is now as closely watched as his Saudi counterpart
https://www.bloomberg.com/news/articles/2017-12-20/putin-s-mr-opec-becomes-an-oil-market-player
http://day.kyiv.ua/ru/article/den-planety/moshchnyy-signal-agressoru
https://politeka.net/reading/555901-novaya-igra-putina-zachem-vyvel-rossijskih-ofitserov-s-donbassa/