MoneyWeek | Russian Ruble Falls Further as Oil Price Tumbles ABC News The sale of oil is Russia's main revenue earner, so the months-long slump in energy markets has weighed on the country's economic outlook and markets. The price of Brent crude, an international variety of oil, has plunged from $115 a barrel in June to ... Prediction of the day: 'Oil back to $70 in 2015' Ruble tumbles further along with oil prices Russian ruble keeps falling as oil prices tumble |