By Nichola Saminather and Hideyuki Sano
SINGAPORE/TOKYO (Reuters) - Asian shares were volatile on Wednesday as a U.S. Federal Reserve policy decision later in the day and Brexit worries kept investors on edge, though China took in stride MSCI's decision not to include domestic Chinese equities in its indexes.
European shares were set for a positive open, with financial spreadbetters expecting Britain's FTSE 100 (FTSE) to open up 0.2 percent, Germany's DAX (GDAXI) 0.5 percent and France's CAC (FCHI) 0.4 percent.
MSCI's broadest index of Asia-Pacific shares outside Japan (MIAPJ0000PUS) were unchanged at 0640 GMT, after earlier swinging between gains and losses. The index slid 3.8 percent over the previous four trading days.
Japan's Nikkei (N225) closed up 0.4 percent.
Mainland Chinese shares, among Asia's worst performers this year, reversed initial losses, as investors, who had expected Chinese A-shares to be included in the emerging market index, pondered the U.S. index provider's decision.
China's CSI 300 index <.CSI300> and the Shanghai Composite <.SSEC> advanced 1.2 percent and 1.4 percent respectively. Hong Kong's Hang Seng index (HSI), which opened lower, gained 0.2 percent.
"Maybe regional investors have taken the view that the Brexit-driven sell-off was a bit overdone," said Shane Oliver, head of investment strategy at AMP Capital in Sydney. "Too early to ring the all-clear bell though, as uncertainty regarding Brexit will linger for at least another week yet."
"On China, I suspect the bounce so far indicates the importance of the MSCI decision was overstated," he added.
MSCI said it decided not to add local Chinese shares to its key emerging market index as Beijing had more work to do in liberalising capital markets.
The Chinese central bank set the yuan midpoint rate
The offshore yuan
On Wall Street, S&P 500 Index (SPX) hit a three-week low to end at 2,075.32 on Tuesday, down 0.18 percent, in its fourth consecutive drop, led by a 1.45 percent fall in financial shares (SPSY).
The Federal Reserve concludes its two-day June meeting later in the day. Fed funds futures
The 10-year U.S. debt yield fell to a four-month low of 1.567 percent (US10YT=RR) on Tuesday and last stood at 1.6198 percent.
Concerns over a British referendum next week that could see it exit the European Union dwarfed any optimism from solid U.S. retail sales data published on Tuesday.
"The last thing investors needed was further Brexit angst but the continued flow of opinion polls pointing to a possible 'leave' outcome has caused a further reassessment of risk profiling with respect to the outcome of next week’s vote," Michael Hewson, chief market analyst at CMC Markets in London, wrote in a note.
"This risk is likely to be at the forefront of today’s Federal Open Market Committee rate meeting where U.S. officials look set to keep rates on hold."
Worries that Brexit will deal a significant blow to the integration of Europe have helped to push up borrowing costs of European countries with weak credit ratings.
The gap between 10-year Portuguese bond yields
Investors instead flocked to the safety of German bunds, whose yield <DE10YT=TWEB> fell below zero for the first time in history on Tuesday.
The British pound
The safe-haven Japanese yen also held firm, staying near a six-week high against the dollar and a 3 1/2-year high against the euro.
The yen <JPY=> was changing hands at 106.25 to the dollar, having hit a six-week high of 105.63 on Tuesday. The euro stood at 118.92 yen (EURJPY=R) after falling to a low of 118.48.
Investors also took shelter in gold <XAU=>, which held steady at $1,285.30, near the 5 1/2-week high of $1,289.80 seen overnight.
Brexit fears, combined with a surprise build in U.S. inventories, weighed on oil.
U.S. crude <.CLc1> dropped 1.3 percent to $47.88 a barrel, after earlier touching a 3 1/2-week low of $$47.55.
Brent (LCOc1) also slid 1.3 percent, to $49.18. It earlier fell to a near-two-week low of $48.91.
