Russian 500 and 1000 denomination ruble banknotes are held for a photo outside the Thomas Exchange Global Ltd. foreign currency exchange in London, U.K., on Wednesday, Dec. 17, 2014. The ruble has collapsed more than 50 percent since June, even after the central bank increased its benchmark rate by 6.5 percentage points this week and spent about $10 billion of its reserves trying to halt the decline. Photographer: Chris Ratcliffe/Bloomberg via Getty Images
