LONDON (Reuters) – The dollar strengthened as oil prices steadied, commodity currencies pulled back from some of their recent gains and the Japanese yen sunk to its lowest since 2015. Equity markets were volatile, struggling to make gains in the Asian session, after more hawkish comments from the U.S. Federal Reserve made investors more cautious. Fed policymakers signalled on Wednesday that they could take more aggressive action to bring down inflation, including a possible half-percentage-point interest rate hike at the next policy meeting in May. The Japanese yen fell against the U.S. dollar…

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