In a scenario in which oil slips to $50 a barrel, Russia's RTS Index would likely fall to 900 to 1,000 from its current level of 1290, Troika Dialog says. The ruble would slip to between 35 and 37 to the dollar, while corporate profits would drop 30%, according to the broker. Mobile telecoms would outperform the rest of the market, assuming their is no "panic," broker says, while if shares dropped enough, oil and gas shares might be the best buy because they would likely be the "cheapest." Troika says "many are concerned" what would happen to Russian securities if oil slipped to around $50.