https://www.depo.ua/ukr/svit/ukrayina-vigrala-u-gazpromu-stokgolmskiy-arbitrazh-20171222698277
https://www.kommersant.ru/doc/3503471
https://ru.krymr.com/a/28931434.html
https://www.rbc.ru/newspaper/2017/12/21/5a3a284b9a7947ac20f113d7
https://www.ft.com/content/c42aa230-e489-11e7-97e2-916d4fbac0da
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://www.finanz.ru/novosti/aktsii/kitay-zabrakoval-ceny-na-rossiyskiy-gaz-1011685032
https://www.gazeta.ru/business/2017/12/20/11501654.shtml?updated
https://www.vedomosti.ru/politics/articles/2017/12/20/745989-pensiyu-zamorozili