Russian President Vladimir Putin began his fourth term with an unexpected weapon in his arsenal against Western sanctions: higher oil prices.
The big, rushed and opaque deal for an enigmatic Chinese energy company to buy into Russia’s state oil behemoth has disintegrated.
http://expert.ru/2018/05/7/tsena-na-neft/
https://www.kommersant.ru/doc/3619979
https://www.gazeta.ru/business/2018/05/07/11742691.shtml
https://inosmi.ru/economic/20180507/242162425.html