EU: EXCHANGING CLASSIFIED DOCUMENTS: A HIERARCHY OF TRUST
02 October 2013
Some (including UN and NATO) given access to classified documents no higher that RESTRICTED (the lowest level) but most will get only unclassified documents.
See:
Council of the European Union: Authorisation to release EU classified information to third States and international organisations in the context of the EU Crisis Management Exercise MILEX 13 (pdf)