There are the glimmers of a plan: strengthen the banks to withstand the shock of default and then build a massive firewall around Greece to avoid a domino effect.

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To combat this risk, European leaders have agreed a 700bn-euro firewall to protect the rest of the eurozone from a full-blown Greek default.

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If the euro zone had put a credible firewall around the government bonds of Italy and other troubled euro countries, a Greek default would not now be threatening contagion.

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European Union governments will spend the next six weeks building a financial firewall to protect their fragile banking systems against what is now seen as an inevitable Greek default.

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