MarketWatch | Russian ruble leads commodity currencies lower as oil retrea MarketWatch The worst performer was the Russian ruble USDRUB, -0.4479% which tumbled to 66.4495 to the dollar—its weakest level in a week and a half—after oil trading opened, before paring its loss to 67.3977 to the dollar in recent trade, a daily drop of 1.7%. Asia stocks drop as oil tumbles; Nikkei off 3.4% after quake Canadian Dollar A 'Main Victim' Of Collapse Of Global Oil Talks Oil price slump drags down Asian markets |