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The diplomat added that eurozone leaders hoped noneurozone countries would contribute an extra 50 billion euros ($67 billion).

With so much at stake on the summit’s results, U.S. Treasury Secretary Timothy F. Geithner was zipping across Europe on a three-day trip to press the region’s leaders to solve their differences.

Reforms to deal with the debt crisis are “vital,” but their implementation will take some time, Mr. Geithner said in Milan, where he met new Italian Premier Mario Monti, who also is minister of economy and finance.

Secretary of State Hillary Rodham Clinton, who was in Brussels, said the United States was willing to offer assistance, “but we do need a plan to rally behind, to know the way forward.”

Jamey Keaten reported from Marseille. Greg Keller in Paris, Gabriele Steinhauser in Brussels and Martin Crutsinger in Milan contributed to this report.