The G20 aren't running to Europe's rescue

It looks as though the shakedown failed. France could not persuade the rest of the G20 to commit hard numbers to providing a bigger financial safety net for the eurozone - or anyone else who might need it.

A senior US official has just explained the lack of numbers in today's final G20 communique, in the crucial bit about the global tools available for responding to future crises.

The tool that had been talked up most aggressively was the idea of another special allocation of IMF Special Drawing Rights - in effect, free money for International Monetary Fund (IMF) members. China and France supported this, but America was against. (Interestingly, Germany was against this particular proposal too. It seems they don't like the IMF printing money for governments any more than they like the European Central Bank doing it.)

Here's what the official said: "We're talking about Europe - this is about the future of Europe. And the Europeans recognise more than anyone else that their future is in their hands." He said that Europe had the resources and tools to do this, and the tools being talked about at a global level were simply reinforcement: "They are complements, not substitutes."

Asked whether other countries would be contributing to Europe's "firewall", he said: "Don't think about it as Europe's firewall. Europe's firewall is primarily about Europe. As we saw at the start of 2009, this is about wanting to make sure we're prepared and ready, if that makes sense, if global action is needed." But, he added, the priority was for the Europeans to act.

So, the G20 has concluded that it's up to the Europeans to fix this. The rest of the world needs to see more progress on the European rescue plan sketched out last week in Brussels before they commit any hard numbers. If they ever do.

That's one of the big stories out of Cannes - which perhaps would not have surprised anyone a week ago, before the great dramas which erupted in Athens.

But let's not forget that two crucial taboos have been broken in the past few days.

European leaders have publicly contemplated the possibility that a country might leave the euro. And they have included in the same sentence the words "IMF" and "Italy".

Taboos get created out of a natural human superstition: that bad things become more likely once you utter them out loud. The Europeans have to hope the financial markets aren't superstitious.