Spreadbetters, however, expected Greek debt matters to reclaim the spotlight in Europe ahead of the euro zone finance ministers' meeting later in the day. They forecast a lower open for Britain's FTSE, Germany's DAX and France's CAC.

After a closely-watched two-day meeting, the Fed said the economy was likely strong enough to support an interest rate increase by the end of the year. But it lowered its forecasts for 2015 economic growth because of a weak start to the year and reduced its federal funds rate forecast.

MSCI's broadest index of Asia-Pacific shares outside Japan climbed about 0.3 percent, while Japan's Nikkei  skidded 0.8 percent to a one-week low as the yen gained against the USA.

"The market is rather concerned about the US economic view in the future," said Masaru Hamasaki, head of the Market and Investment Information Department at Amundi Japan.

South Korean shares were poised to post their sharpest daily gain in four weeks, with the Korea Composite Stock Price Index  rising 0.7 percent.

Some of the region's other shares did not fare as well, with Chinese shares coming under pressure from a string of initial public offerings, while Australian stocks shed 1.6 percent amid selling by investors before closing their books at the end of the month.

On Wednesday, Wall Street shares inched higher in a choppy session following the Fed's statements, with the Dow  rising 0.17 percent and S&P gaining 0.2 percent. The Fed's stance had tripped up some investors who had expected the central bank to signal a rate hike as early as September.

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