“There is no question of setting up a European fund,” he said.

Announcements last week by Britain and the United States that they would move to take ownership shares in ailing banks, the 15 leaders of the countries that use the euro found themselves looking for a collective response to avoid tit-for-tat actions by individual countries that might harm their neighbors.

Mr. Brown said earlier after meeting at the Elysée Palace with Mr. Sarkozy, that he believed Europe would “work together with America.” Mr. Brown, whose country has maintained its own currency, the pound, also warned that the decisions made Sunday would have economic consequences for years to come.

In contrast to the meeting last weekend, European leaders on Sunday seemed to be reading from the same script.

“Our goal is to have coordinated action for the euro zone,” Angela Merkel, the German chancellor, said, and the meeting “is a very important signal for the strength of the euro zone.”

Germany is considering a plan to inject 50 billion to 100 billion euros into its banks, with a price tag for all of the new measures reaching as much as 400 billion euros, or $536 billion, according to a person briefed on the government’s work. A German official cautioned that the numbers remained speculative.

Current plans are to have the package approved by the cabinet on Monday and through the German Parliament this week.

France is expected to announce a two-pronged plan aimed at safeguarding the solvency of French banks and jump-start lending between financial institution, according to a senior official who has worked on the plan.