From the end of the year, chaos threatens security policy – Brexit explained

A decision between the EU and Great Britain on security issues is not in sight.
Experts have been warning of consequences since. In just five months after that event occurs that the responsible guidelines in the EU and in the United States are controlled: the “No-Deal-Brexit 2.0”.

In January, when Great Britain was granted EU authorization, both sides had evolved towards an exit agreement that prevented customs controls. But if talks on a trade deal between London and Brussels don’t make brisk progress, rights will see new trade barriers from early 2021.