"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.
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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)