Russia's richest lose $10b

Russia's 20 richest people lost $10 billion this week as the central bank raised interest rates to counter Western sanctions that have crushed the ruble and sent the country's RTS Index to its lowest point since March 2009.

The billionaires have dropped a combined $62 billion in 2014, according to the Bloomberg Billionaires Index, and control a combined $174 billion. The European Union and US limited Russian companies' access to financing to punish President Vladimir Putin after he annexed Crimea in March. Russia's troubles have been worsened by the corresponding plunge in the price of oil, a bedrock of the country's economy.

The ruble has plummeted 50 percent since the end of June. Crude fell to a five-year low after the United Arab Emirates said OPEC will not rein in production. In response, Russia's central bank raised its benchmark interest rate to 17 percent from 10.5 percent in the middle of the night in Moscow on Monday as the ruble slid below 64 per dollar for the first time.