PARIS — In the long euro crisis, there is almost always a sobering morning-after whenever European leaders appear to have made a major breakthrough. And so it went again on Friday.

Greeted with initial fanfare by investors and economic officials, the unlimited bond-buying plan that the European Central Bank president, Mario Draghi, announced Thursday ran into immediate political problems in the crucial countries of Germany, Spain and Italy.

In Germany, despite Chancellor Angela Merkel’s support for Mr. Draghi and the independence of the Central Bank, political and news media reaction was scathing, with accusations that the bank, in seeking to stabilize the euro currency union, was subverting its mandate to fight inflation and forcing debt upon euro zone members.

“A Black Day for the Euro,” “Over the Red Line” and “Pandora’s Box Opened Forever” were some of the German headlines, with the normally sympathetic Süddeutsche Zeitung headlining an editorial: “The E.C.B. Rewards Mismanagement.” Even the German Bundesbank, officially part of the European Central Bank, put out a statement commenting acidly that the plan was “financing governments by printing bank notes.”