TEXT-S&P afrms 'BB' on Russian Holding Sistema By: Reuters: Company News February 03, 2012 at 06:26 AM EST -- We have affirmed our 'BB' rating on Russia-based Mobile TeleSystems (OJSC) (MTS), the strongest subsidiary of operating holding company Sistema (JSFC). Read More >> Related Stocks: Mobile Telesystems Public Joint Stock CO Spectra Prods Inc