London, 25 March 2014 -- Moody's Investors Service has today said that Mobile TeleSystems OJSC's (MTS; Ba2 positive) rating benefits from the company's continuing strong operating and financial performance. However, the rating is constrained by a degree of uncertainty over developments in the competitive environment of the company's core Russian market as a result of the introduction of mobile number portability (MNP) in December 2013, as well as the establishment of a joint venture between Tele2 Russia (unrated) and Rostelecom (unrated). In addition, MTS's rating is constrained by uncertainty with regard to the ongoing conflict between Russia and Ukraine, which may adversely affect MTS's businesses in both countries, although to differing extents.

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