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"Member states, including France and Germany, and various EU institutions are ready to take decisive measures," Fillon told reporters after meeting Japanese Prime Minister Yoshihiko Noda.
EU leaders hold talks Sunday to try to hammer out a comprehensive plan for tackling the euro zone debt crisis, but a breakthrough is not expected until another summit on Wednesday.
France hosts the Group of 20 summit early next month and Europe's efforts to contain its debt crisis will be a key issue on the summit's agenda.
(Reporting by Yoko Kubota; Editing by Tomasz Janowski)