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 was signed on 30 December 2020, was applied provisionally as of 1 January 2021 and entered into force on 1 May 2021