Essar said it "signed a non-binding Term Sheet with regard to Rosneft's participation in the equity capital of Essar Oil Limited with a share of up to 49 per cent."
The proposed transaction is conditional upon various factors such as due diligence, determination of the transaction price, execution of definitive transaction documents and receipt of requisite approvals, it said in a statement.
Not disclosing the price, Essar said "appropriate disclosures shall be made in accordance with applicable law as and when any definitive steps in relation to the aforesaid are undertaken."
This contract has been signed in pursuance to the Key Terms executed between the two companies in December 2014 at New Delhi.
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"Essar Oil operates the second largest single location refinery in India and has a large requirement of crude oil that has to be primarily met by imports. This Long Term Crude Oil Supply Agreement with a large integrated oil company like Rosneft will help Essar Oil to diversify its supply sources, expand geographical market coverage and enhance supply security," the statement said.
Prashant Ruia, Chairman of Essar Oil hoped that the agreements will give a boost to increased cooperation in the hydrocarbon sector between India and Russia.