Kiev is investigating whether an international organised crime group controls the supply of natural gas from Turkmenistan to Europe, the chief of the Ukrainian security service has told the Financial Times.

Olexander Turchinov, head of the SBU, the Ukrainian security service, said his agency was investigating whether Rosukrenergo, a Swiss-registered company half-owned by Gazprom, the Russian state oil group, and other companies involved in the Turkmen gas trade were indirectly controlled by Semyon Mogilevich, a Ukraine-born Russian citizen on the FBI?s wanted list.