Under the agreement, France will significantly expand its coastal security presence, increasing the number of officers tackling irregular migration by more than 50% to reach 1,400 by 2029. The funding from United Kingdom will be partly conditional, with nearly a quarter tied to performance benchmarks assessing the effectiveness of French actions.

The deal follows months of negotiations between United Kingdom and France over renewing the Sandhurst Treaty, which governs British financial contributions toward efforts to prevent migrants from departing French shores.

British authorities have long argued that France needed to do more to stop departures, as crossings by small boats have become a politically sensitive issue in the UK. London had insisted on tighter oversight and conditions on how funds are deployed before agreeing to renew the framework, first signed in 2018 and extended in 2023.

According to the roadmap, funding allocations could be redirected if joint annual assessments determine that the measures fail to deliver sufficient results. French authorities also plan to deploy additional surveillance tools, including drones, helicopters and digital monitoring systems, to reduce departures, particularly those involving so-called “taxi boats.”

Under international maritime law, authorities are limited in their ability to intervene once vessels have left shore, focusing primarily on rescue operations to prevent loss of life.

Official British data shows that 41,472 people reached the UK via irregular small-boat crossings in 2025, the second-highest annual figure since such journeys were first recorded in 2018.

At least 29 migrants died attempting the crossing that year, according to figures compiled from French and British sources.