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The yen rose across the board on Wednesday as political instability in Egypt and Portugal prompted investors to seek refuge in the Japanese currency.
The dollar breached 100 yen again to hit a four-week high on Tuesday amid growing optimism that U.S. jobs data will prompt the Federal Reserve to scale back stimulus.
The dollar fell against most currencies, while the yen dropped to its lowest in nearly four weeks versus the greenback on Monday.
The sell-off in commodity currencies over the past two weeks has hit the Norwegian krone particularly hard, but according to one strategist the decline is "overdone" and the krone is set for a rebound.
The dollar advanced against the yen and the euro on Friday as investors resumed pricing in the possibility that the Federal Reserve will begin to pare back its bond-buying program as soon as its September policy meeting.
The dollar slid against the euro on Thursday, after two days of gains as Federal Reserve officials downplayed expectations the U.S. central bank would start scaling back its stimulus program and said the Fed could buy bonds again if the economy weakens.
The euro declined to a three-week low against the U.S. dollar and fell against Japan's yen on Wednesday after ECB President Mario Draghi highlighted risks to euro zone growth and said monetary policy will stay accommodative.
The euro hit session highs on Monday, rallying from nearly three week lows, in tandem with U.S. stocks paring their losses and commodities gaining sharply.
The U.S. dollar was headed for its biggest weekly gain in almost a year against major currencies on Friday.
The dollar trimmed its gains versus the euro and yen after data showed the number of Americans filing new claims for unemployment benefits rose more than expected last week.
Live from St Petersburg, CNBC's Geoff Cutmore and Steve Sedgwick kick-off the St Petersburg International Economic Forum with a First on CNBC interview by Hans Vestberg, CEO of Ericsson.
The U.S. dollar reversed early losses and rose against the euro and yen on Wednesday after the Federal Reserve said it sees diminished downside risks to the economy.
The U.S. dollar rose for a second day against the yen on Tuesday as some traders bet the Federal Reserve may signal it is almost ready to reduce its bond buying program.
The yen fell against the dollar and the euro as global stocks rebounded, but the Japanese currency may stay near two-month highs until investors get more clarity on the Federal Reserve's ultra-loose policy.
The yen rose against the U.S. dollar on Friday for a fourth straight day as investors unwound bets against the Japanese currency due to uncertainty surrounding central banks.
The yen rose against the dollar to levels not seen since the Bank of Japan unleashed its aggressive stimulus in early April.
The dollar recovered lost ground against the yen on Wednesday after a sharp sell-off the previous day as investors sought to buy at cheaper levels.
The yen soared on Tuesday after the Bank of Japan decided not to announce additional measures to curb recent volatility in the bond market.
The dollar rose sharply versus the yen on Monday, bolstered by stronger-than-forecast Japanese data and a Standard & Poor's upgrade to the credit outlook for the United States.
The dollar recovered on Friday from steep losses in the previous session after a government report showed a reasonably healthy pace of U.S. job creation in May.