European leaders will gather Wednesday for a summit to put summer tensions over migration behind them and to set up the last stretch of talks for a Brexit deal.

The European Union’s top officials face intense pressure in the coming weeks to seal a divorce deal and a plan for future ties with Britain to avert a chaotic exit in March.

In effect, the Salzburg gathering has become the first in an expected series of three summits in successive months to finalise London and Brussels’ break-up.