France will ask the European Union to file a lawsuit against the United Kingdom if the fishing problem is not solved on Friday.

The European Commission previously set a deadline for the British on December 10. The United Kingdom must then have met Member States’ concerns about fishing licences.

Paris and London have quarrelled over fisheries since the United Kingdom left the European Union. Under the agreements made after Brexit, licenses must be granted to fishermen who want to fish in each other’s waters, but the implementation is complex.

According to the French authorities, the British still have to approve almost 100 licenses for French fishermen. The United Kingdom states that the correct documentation is often lacking.

Earlier this year, French authorities seized a British fishing boat over the dispute. In addition, French authorities threatened trade measures and French fishermen erected blockades to disrupt trade.

French European Affairs Minister Clément Beaune told French radio that the United Kingdom is trying to isolate France from the European Union in the dispute over fishing licenses. He stressed that the European bloc is “united” on the issue.