There must be an EU “currency commissioner” with sweeping powers to strike down national budgets; a “large step towards fiscal union”; and yet another EU treaty.

Finance minister Wolfgang Schaeuble dropped his bombshell in talks with German journalists on a flight from Asia, and apparently had the blessing of Angela Merkel, the chancellor. “When I put forward such proposals, you can take it as a given that the chancellor agrees,” he said.

Officials in Brussels reacted with horror. “If that is the demand, they are not going to get it. Nobody in the Council wants a new treaty right now,” said one EU diplomat.

“We’ve got the fiscal compact and quite enough fiscal discipline. Not even the Dutch want a commissioner telling them how to tax and spend,” he said.

The new demands risk another stormy summit in Brussels on Thursday, pitting Germany against the Latin bloc. The last summit in June ended with an acrimonious deal in the small hours on a banking union that began to unravel within days.

Mr Schaeuble said the currency chief should have powers similar to those of the EU’s competition commissioner, a man “feared around the world”.

The competition Tsar is the arch-enforcer of the EU machine, with powers to launch dawn raids, deploy SWAT teams, and block mergers on his own authority. The job was the making of Italy’s Mario Monti a decade ago when he blocked the GE-Honeywell merger after it had been cleared by Washington.

The Schaeuble plan is highly provocative. The EU can set deficit targets but it cannot manage budgets, unless a country requests a bail-out and gives up fiscal sovereignty.

Nor is it clear how Germany’s constitutional court would react. It ruled last year that the Bundestag’s budgetary powers are the bedrock of democracy and cannot be alienated to any supra-national body.

Mr Schaeuble poured scorn on counter-proposals by EU president Herman Van Rompuy, including a first step towards debt pooling through joint “eurobills”. The term “Fiskalunion” in Berlin has a specific meaning: more power to police the affairs of debtor states. It does not mean debt mutualisation or a joint EU treasury. Germany has so far refused to cross this Rubicon.

Michael Link, the country’s Europe minister, said Mr Van Rompuy’s plans are dead on arrival. “When you make proposals that are simply unacceptable for certain members, this will only give the impression of division. You can phrase it any way you like, ‘treasury bills’, ‘debt-redemption funds’ or ‘eurobonds’, this type of debt issuance will not fly with our government. We have always said this very clearly.”