The troubles at Yuganskneftegas come as Gazprom , the giant state-controlled energy company , is poised to buy the privately held Sibneft , Russia 's fifth-largest oil producer with more than 900,000 barrels a day , from Roman Abramovich , a Russian tycoon based in London .
Roman Abramovich
Russia
/people/person/nationality
Russian
Russia
/people/ethnicity/geographic_distribution
ORGANIZATION
Gazprom
LOCATION
Russia
PERSON
Roman Abramovich
LOCATION
Russian
LOCATION
London