Financial leaders from the world's 20 biggest economies promised on Saturday not to devalue their currencies to boost exports, aiming to defuse talk of currency wars that had been roiling the markets.
The euro gained 0.2 per cent to 125.32 yen, edging up toward a 34-month high of 127.71 yen hit earlier this month, while the dollar rose 0.6 per cent to 94 yen, closer to its highest level since May 2010 of 94.46 hit on February 11.
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"Future yen direction will continue to be driven by domestic monetary policy from the Bank of Japan and improving international investor confidence, which are both driving the yen weaker," said Lee Hardman, currency analyst at Bank of Tokyo-Mitsubishi UFJ.
Japanese Prime Minister Shinzo Abe is poised to nominate a new BOJ governor. Sources told Reuters that former financial bureaucrat Toshiro Muto, considered likely to be less radical than other candidates, was leading the field.
Abe said on Monday that buying foreign bonds was a future option for the Bank of Japan, which would entail selling of the yen by the central bank.
The euro was also rising against the dollar, gaining 0.1 per cent to $1.3375 ahead of address by European Central Bank president Mario Draghi to the region's parliament which may touch on the outlook for the single currency after the G20 meeting.
In European markets, attention was also switching to the release of euro area Purchasing Managers' Indexes for February and German sentiment indices due later in the week, and the upcoming general elections in Italy.
Analysts expect Thursday's euro area flash PMI indices, which point to economic activity around six months out, to show growth stabilising across the recession-hit region, leaving hopes for a recovery in the second half of the year intact.
Concerns over an inconclusive outcome in Italian elections at the end of the week added to the weaker sentiment as a fragmented parliament could hamper a future government's reform efforts.
The worries about the outlook for Italy were encouraging investors back into safe have German government bonds on Monday, with 10-year Bond yields easing 3.6 basis points to be around 1.63 per cent.
"Political uncertainty will keep Bonds well bid this week," ING rate strategist Alessandro Giansanti said, adding that only better than expected economic data could create selling pressure on German debt near term.
Earnings hit
European equity markets were taking their lead from corporate earnings reports which have been reflecting the sluggish economic conditions across the region.
Danish brewer Carlsberg, which generates just over 60 per cent of its sales in western Europe, became the latest company to report a weaker-than-expected quarterly profit, sending its shares to lowest level in nearly a month.
The 5 per cent drop in price for shares in the world's fourth biggest brewery helped send the FTSEurofirst 300 index of top European shares down 0.4 per cent in morning trade. Germany's DAX, the UK FTSE and France's CAC-40 were all also slightly weaker.
Earlier, the effect of the G20 statement and the comments from Abe indicating a renewed drive to stimulate the economy lifted the Nikkei stock index by 2.1 per cent, near to its highest level since September 2008.
US stock futures were barely changed and are expected to stay little changed as Wall Street will be closed on Monday for the Presidents' Day holiday.
MSCI's world equity index was flat as markets extended two-week period of consolidation that has followed the big run up in January when demand was buoyed by the efforts of global central banks to stimulate the world economy.
Data from EPFR Global, a US-based firm that tracks the flows and allocations of funds globally, shows investors pulled $3.62 billion from U.S. stock funds in the latest week, the most in 10 weeks after taking a neutral stance the prior week.
But demand for emerging market equities remained strong, with investors putting $1.81 billion in new cash into stock funds, the fund-tracking firm said.
China return
In the commodity markets traders played catch up after a week-long holiday last week in China, the world's second biggest consumer of many raw materials, had kept activity subdued, with worries about the euro zone economy weighing on sentiment.
Copper, for which China is the world's largest consumer, fell 0.8 per cent to $8,135 a tonne on the London futures market.
Gold rebounded by 0.3 per cent from a six-month low to be $1,614 an ounce as jewellers in China returned to the physical market after the Lunar New Year holiday.
Crude oil markets were mostly steady after some weak U.S. industrial production data on Friday was seen dampening demand, while tensions in the Middle East lent some support.
US crude fell 20 cents to $95.66 a barrel but Brent inched up two cents $117.86.