https://www.gazeta.ru/business/2017/12/27/11553206.shtml
https://www.kommersant.ru/doc/3509100
https://www.rbc.ru/newspaper/2017/12/22/5a3bb2a39a79479a26968f06
https://www.kommersant.ru/doc/3503657
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://day.kyiv.ua/ru/blog/politika/lovushka-dlya-ministra
http://www.rosbalt.ru/russia/2017/12/15/1668891.html
https://www.novayagazeta.ru/articles/2017/12/15/74932-delo-ulyukaeva-glavnoe