Dow Jones Newswires reports that MTS, Russia’s biggest mobile operator, today offered to buy up to 9 percent of shares in its OAO Comstar United TeleSystems fixed-line unit for 220 rubles (US$7.08) each as a part of the companies’ merger.  Separately, the companies said their boards had approved the sale of a 25 percent-plus-one-share stake in national telecom holding OAO Svyazinvest to state-controlled OAO Rostelecom for RUB26 billion, in order to repay bank debt.