A person with direct knowledge of the matter said earlier on Thursday that Ye Jianming, the CEFC chairman, has been investigated for suspected economic crimes.

CEFC has agreed to buy a nearly $10 billion (7.3 billion pounds) stake in Russian oil major Rosneft.

"It (the investigation) is not related to us," Rosneft spokesman Mikhail Leontyev said on Thursday.

"It would be stupid to comment on this information."

(Reporting by Olesya Astakhova and Katya Golubkova; Writing by Maria Tsvetkova; Editing by Andrew Osborn)

Stocks treated in this article : NK Rosneft' PAO, En+ Group PLC