EU leaders say they are ready to act to shore up Greece's finances and ensure stability in the eurozone - but they have made no specific promise of aid.
Greece must take further measures to tackle its huge debts and cut its budget deficit by 4% this year, the EU leaders said after a Brussels summit.
The statement did not spell out what was meant by "determined and co-ordinated action, if needed".
Greece's debt crisis has put pressure on the euro, making markets nervous.
Gavin Hewitt reports.
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