The story

Gazprom is the world's biggest producer and exporter of natural gas -- and Russia's most powerful company.

It controls 20 percent of the world's natural gas reserves and operates the world's largest gas distribution network -- approximately 157,000 kilometers of pipelines covering an area from Europe to the Far East, according to its Web site.

Gazprom exports energy to 32 countries and provides around 25 percent of the European Union's gas supplies. Read full article »