https://www.kommersant.ru/doc/4252745
https://www.inopressa.ru/article/14Feb2020/handelsblatt/opec.html
https://www.kommersant.ru/doc/4252877
https://jamestown.org/program/russia-and-belarus-enter-a-new-phase-in-their-energy-relations/
https://www.gazeta.ru/business/2020/02/12/12957043.shtml
https://www.gazeta.ru/business/2020/02/10/12953947.shtml