00573naa#a2200193#i#450# EN\INFRA-M\bibl\5367 20240504184909.6 2226-7867 20150317b2015####ek#y0engy0150####ca RUS RU Opportunities for Investments in Russian Energy Sector: Political Risks Journal article Moscow INFRA-M Academic Publishing LLC. 2015 0 с. Journal article local Petrosyants Daniel Simonov Konstantin Vasileva Ekaterina naukaru.ru