https://www.kommersant.ru/doc/3507375
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
https://www.inopressa.ru/article/20Dec2017/bloomberg/novak.html
https://www.kommersant.ru/doc/3480617
http://nvo.ng.ru/gpolit/2017-12-15/1_977_antagonists.html
https://newtimes.ru/articles/detail/134899
https://focus.ua/world/386938/
https://www.kommersant.ru/doc/3488338