After failing to quell a succession of crises, European Union leaders will gather in Bratislava, the capital of Slovakia, on Friday to seek a unified response to Britain’s decision to leave the bloc.

The leaders are also expected to discuss upgrading their defense cooperation and cracking down on clandestine migration. But the meeting is described as “informal,” and major breakthroughs appear beyond grasp at this point.

Three months after the vote for “Brexit,” as Britain’s decision to leave the bloc is known, the European Union has done almost nothing to respond to the sentiment behind that vote — and it has shown few signs that it can take effective measures to address public concerns.

Still, the summit meeting will be rich in symbolism: Prime Minister Theresa May of Britain will be excluded, a signal that the survival of the European Union will require the other 27 member states to make a fresh start.