Russia's ruble is under renewed pressure after the Central Bank of Russia shocked markets with a rate cut, sending the currency to a 2015 low.» Read More
The dollar was steady ahead of Janet Yellen's testimony in Congress, while Norway's crown jetted almost 1 percent higher.
Global currency markets trod water ahead of interest rate decisions in Britain and the euro zone on Thursday.
The yen gained on Wednesday, as struggles in stock markets and the emerging markets forced investors to seek safe-haven currencies.
The Singapore dollar sealed its safe haven status this week, strengthening against its peers amid a selloff in global equity markets. CNBC's Julia Wood reports.
The Australian dollar surged almost two percent on Tuesday after moves from the country's central bank dropped.
The euro was soft on Monday as investors thought it more likely the European Central Bank would have to ease policy to combat slowing inflation.
The euro fell as soft euro zone inflation data rekindled concerns the ECB may have to act to combat deflation, while the dollar gained.
The dollar rose against a basket of currencies on Thursday after data showed the US economy produced solid growth in the fourth quarter.
Several analysts see an upside for Russia to the emerging market rout, seeing it as "easy money" for the government's coffers.
The yen rose against the dollar, suggesting emergency action to stabilize Turkey would not be enough to quell nerves over emerging markets.
The dollar regained a firmer footing against the yen on Tuesday as investors took a breather from a sell-off of stocks and emerging market assets.
Safe-haven currencies like the yen and the Swiss franc were much in demand on Monday as an emerging markets sell-off continued.
The yen, Swiss franc and euro charged higher amid worries about a China slowdown and turmoil in some emerging markets.
Sterling rose to an almost three-year high against the dollar on growing expectations that the BoE will raise interest rates sooner.
The Asia Squawk Box team discusses a new survey that shows Singapore's work force is the unhappiest in Asia. Paul Krake, Founder, View from the Peak: Macro Strategies, also weighs in.
The dollar slipped on Wednesday, hurt by gains in sterling and the Australian currency.
The dollar rose versus the yen on Tuesday, helped by renewed talk that the U.S. Federal Reserve may announce a further taper next week.
Claudio Piron, Head of EM Asia Rates Strategy at BofA Merrill Lynch Global Research, explains why he doesn't think higher wealth taxes will destabilize the Singaporean economy.
The euro recovered slightly from a two-month low against the dollar on Monday, helped by higher short-term market interest rates.
The Australian dollar tumbled to its lowest level since mid-2010 against a firmer U.S. dollar on Thursday.