The exchange of classified information between partners remains an important tool of cooperation in addressing common security threats.

If a joint security threat makes it necessary, certain EU classified information can be shared with third countries, but only on a case-by-case basis and provided that a dedicated Security of Information Agreement (SIA) has been concluded between the EU and a third country.

Against this background, the EU and the UK have concluded a Security of Information Agreement. The Agreement will allow the EU and the UK to exchange classified information, applying strong guarantees as to the handling and protection of the exchanged information.

The EU-UK Security of Information Agreement is provisionally applicable since 1 January 2021, after having been agreed by EU and UK negotiators on 24 December 2020.