India’s top energy companies including ONGC NSE -0.49 % Videsh Ltd is discussing buying a stake in Russia’s massive Vostok oil project as well as a planned liquefied gas project Arctic LNG-2, Oil Minister Hardeep Singh Puri said. OVL, the overseas arm of state-owned Oil and Natural Gas Corp (ONGC), is evaluating buying a minority stake in the Vostok Oil project, which contains combined estimated resources of over 6 billion tonnes or around 44 billion barrels, of premium crude.