Bulgaria has been perhaps Russia’s most reliable energy customer for decades. But a new government, a cold winter, and a recession could change that. You have reached a premium content area of TOL. To read this entire article please login if you are already a TOL subscriber. Not a subscriber? Subscribe today for access to: Full access to the website, including premium articles videos, country reports and searchable archives (containing over 25,000 articles). You can subscribe here to gain access to the entire website.