Stocks in Japan slipped Wednesday ahead of the conclusion of a U.S. Federal Reserve meeting later in the day, while shares in China rebounded from a more than 5% drop earlier in the week.

Markets in Asia have been hit this week following the collapse of Greece's bailout talks, but losses were limited Wednesday after U.S. stocks rose overnight as the Fed's meeting kicked off.

"Traders will continue to seek an indication of when the central bank [Fed] could start raising interest rates," said Nicholas Teo, analyst at CMC Markets. "At the start of the year, many had thought this could be the liftoff meeting but a soft first quarter pushed the timetable back and no increase is expected this time."

Daiwa Securities FX strategist Yukio Ishizuki added that the result of the Fed meeting is "the main event" for investors.

The Nikkei Stock Average was down 0.4%, while Korea's Kospi and Taiwan's Taiex were both down 0.1%. The Shanghai Composite Index was up 0.4%, recovering from losses of 5.4% Monday and Tuesday.

Investors in China are bracing for more volatility. The Shanghai market has gained more than 50% this year, and investors are increasingly protecting themselves against a selloff.

"The correction in the market over the last two days isn't too surprising if the massive amount of capital locked up for IPOs and the valuations in some sectors are taken into account," said Gerry Alfonso, director of trading at Shenwan Hongyuan Securities. "It is likely that we will experience significant volatility today."

The Japanese yen was at 123.42 against the U.S. dollar, weakening slightly from 123.36 late Tuesday in New York.

Australia's S&P/ASX 200 was up 1% as shares of Woolworths Ltd. rose 1.9% after the retailer lowered its profit outlook and said it would likely cut around 1,200 jobs. Its chief executive, Grant O'Brien, is also leaving.

Australia & New Zealand Banking Group gained 1.8% after The Wall Street Journal reported that the company was seeking buyers for some of its portfolio of loans to commodity trading house Noble Group Ltd.

Bradford Frischkorn contributed to this article.

Write to Chao Deng at Chao.Deng@wsj.com

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