In a new phase of their relationship UK and EU Reset Ties with Historic Post-Brexit Deal Covering Trade, Defence, and Youth Mobility. In a pivotal shift nearly a decade after the Brexit referendum, the United Kingdom and the European Union have signed a comprehensive agreement aimed at resetting relations. The wide-ranging UK-EU deal 2025, announced during a landmark summit in London on May 19, represents the most significant thaw in diplomatic and economic ties since Britain’s EU departure in 2016.