http://www.williamjacob.com/html/ExxonMobil_Sakhalin_Island_summary.html

ExxonMobil - Berkut Platform (Sakhalin Island I)

The Sakhalin I project is a consortium between ExxonMobil affiliate, Exxon Neftegas Limited (ENL), Sakhalin Oil and Gas Development Co. Ltd., ONGC Videsh Ltd., Sakhalinmorneftegas Engineering LLC (SNE) and RN-Astra


http://en.wikipedia.org/wiki/Sakhalin-I#Consortium_partners

Consortium partners
Main article: Exxon Neftegas Limited

30.0% - Exxon Mobil (United States)
30.0% - Sakhalin Oil & Gas Development Co. Ltd. (Japan)
20.0% - ONGC Videsh Ltd. (India)
11.5% - Sakhalinmorneftegas-Shelf (Russia)
8.5% - RN-Astra (Russia)