European Union leaders meet in Brussels on Thursday, hoping to approve a landmark multibillion euro fund for Ukraine that will help keep the country afloat for the next four years, no matter what happens on the battlefield, or in the U.S. Congress threatening to cut support.

The only thing standing in their way is Prime Minister Viktor Orban of Hungary. Again.

A compromise with Mr. Orban, who has demanded an annual veto on the spending, has remained elusive, meaning that the unanimity required for such a deal among the 27 E.U. states still seems out of reach. If Mr. Orban continues to stand in the way, E.U. leaders have made clear they are ready do whatever is necessary to support Ukraine and are prepared to work around him — or even to punish him.

Yet even if the remaining 26 leaders are not forced to go ahead without Mr. Orban, a larger problem is now firmly front and center: What will the E.U. do about its Hungary problem?

Archive