https://www.vedomosti.ru/business/articles/2018/03/02/752615-gazprom
State-owned natural gas company Naftogaz of Ukraine wins a lengthy $2.5 billion legal battle with Russia's Gazprom.
http://www.ng.ru/economics/2018-03-01/1_7183_gazprom.html
https://nv.ua/opinion/fursa/isterichki-iz-hazproma-2454888.html
http://www.bbc.com/russian/features-43239466