French-German Disputes Could Mar European Summit.

BRUSSELS — European Union leaders sought Thursday to overcome sharp differences over how to improve supervision of their banks and budgets, at the start of a two-day summit  meeting aimed at resolving the euro zone crisis.

But with market pressure on their single currency easing, at least for now, there were already signs that leaders could return to a familiar pattern of bickering, which could delay already agreed-to changes, like creating a single regulator for all euro zone banks.

One of the issues overhanging the meeting is a dispute between France and Germany on whether to create such a supervisor by January, as the European Commission has proposed. Paris is pushing to meet that deadline.