(Updates prices at 1020 GMT)
Global currency markets steadied on Monday after the yen hit its lowest level since November, leaving traders on the look out for Japanese government intervention to shore up the currency.
The dollar hit a one-month high against a basket of other major currencies as investors sought a safe haven on concerns about China's economy, but then eased.
Japan's currency JPY=EBS weakened to as low as 145.22 per dollar in early Asian hours, its lowest since Nov. 10, before quickly reversing course in a volatile start to the week. The dollar last fetched 144.96 yen, flat on the day.
The Bank of Japan has stuck to its ultra-loose monetary policy as other global central banks hiked interest rates, making returns in other countries look more attractive and weighing heavily on the yen.
Japan intervened in currency markets last September when the dollar rose past 145 yen, prompting the Ministry of Finance (MOF) to buy the yen and push the pair back to around 140 yen. The yen is down nearly 10% against the dollar for the year.
"Lack of verbal intervention so far suggests that the patience level of Japanese authorities may have gone up after the latest tweak to monetary policy and the disinflation trends in the United States," said Charu Chanana, a market strategist at Saxo Markets.
"Still, traders are potentially cautious of that 145 handle."
Much of the movement in currencies came late in the Asian session, before the market fell into a summer lull.
The euro EUR=EBS slipped before reversing losses to stand flat against the dollar at $1.095.
The early move helped the dollar index =USD rise to 103.02, its highest since early July. It was last very slightly lower at 102.82.
Analysts said investors have been buying the safe-haven dollar over concerns about the health of the global economy, particularly China. They also pointed to a recent rise in U.S. bond yields on the back of persistent strength in the country's economy.
Chinese property giant Country Garden's onshore bonds were suspended, and two Chinese listed companies said over the weekend that they had not received payment on maturing investment products from asset manager Zhongrong International Trust Co.
"High U.S. bond yields and what seems to be a deteriorating environment in the Chinese financial sector are weighing on risk assets," said Chris Turner, head of markets at ING, in emailed comments.
The Australian dollar AUD=D3 slid to its lowest since May at $0.6456 but was last little changed at $0.649. The currency is often seen as a proxy for investor sentiment about China.
Russia's rouble RUBUTSTN=MCX fell past 100 per U.S. dollar on Monday, driven in large part by the Russian current account surplus shrinking sharply as energy export revenue dropped and government spending on the Ukraine war remained high.
Sterling GBP=D3 edged up to $1.271. Economic data could move currencies later in the week. Investors will scrutinise Chinese industrial output and consumer spending data on Tuesday, before minutes from the latest U.S. Federal Reserve meeting on Wednesday. British inflation figures are also due on Wednesday.
Japanese GDP data is due on Tuesday, ahead of inflation figures on Friday.
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