UK Prime Minister Keir Starmer will attend a working dinner in Brussels with all 27 EU leaders to discuss EU-UK defence cooperation, marking the first such meeting since the UK’s formal exit from the EU five years ago.

The meeting, organized by European Council President António Costa, will focus on security issues exacerbated by Russia's invasion of Ukraine, though broader EU-UK relations, including customs arrangements and fishing rights, remain key points of negotiation.

While Starmer has ruled out rejoining the single market or customs union, discussions are expected on improving customs arrangements and resolving the issue of fishing rights.

A package deal encompassing security, fisheries, migration, and other issues is expected, with member states divided on the future of EU defense funding.

No formal conclusions are anticipated from the informal dinner.

The UK and EU are also preparing for an EU-UK summit this spring aimed at resetting the post-Brexit relationship, with further talks planned on energy, migration, and youth mobility agreements.