London, 22 January 2015 -- Moody's Investors Service has today downgraded to Ba1 from Baa3 the rating of Tatneft OAO (Tatneft), an oil & gas company operating in Tatarstan, and converted the company's long-term issuer rating into a corporate family rating (CFR), in line with the rating agency's practice for corporates with non-investment-grade ratings. Concurrently, Moody's has assigned a Ba1-PD probability of default rating (PDR) to Tatneft. The ratings remain on review for further downgrade.

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