WASHINGTON, Feb 6 (Reuters) - Britain's Royal Bank of Scotland Group Plc settled charges it had manipulated the Libor interest rate benchmark, the top U.S. derivatives regulator said, paying fines totaling $612 million to three regulators in the UK and the United States.

The bank neither admitted nor denied its findings, the Commodity Futures Trading Commission (CFTC) said, but a unit in Japan agreed to plead guilty to a criminal charge of wire fraud.

The bank will pay $325 million to the CFTC, $150 million to the U.S. Department of Justice, and 87.5 million pounds ($137.10 million) to the Financial Services Authority.

($1 = 0.6382 British pounds)

(Reporting by Douwe Miedema and Aruna Viswanatha; Editing by Gerald E. McCormick) Keywords: RBS LIBOR/

(douwe.miedema@thomsonreuters.com)(+1 202 310 5442)(Reuters Messaging: douwe.miedema.reuters.com@reuters.net - Follow me on Twitter @d_miedema)

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