On 16 October 2025, the EJN and the Southeast European Prosecutors Advisory Group (SEEPAG) signed a Memorandum of Understanding to enhance their cooperation, exchange best practices, and improve modes of communication between the parties.

SEEPAG is an international judicial cooperation mechanism that aims to facilitate significant cross-border crime investigations and cases. It operates under the umbrella of the Southeast European Law Enforcement Centre (SELEC). The countries covered by both SEEPAG and SELEC include the following: the Republic of Albania, Bosnia and Herzegovina, the Republic of Bulgaria, the Hellenic Republic (Greece), Hungary, the Republic of Moldova, Montenegro, the Republic of North Macedonia, Romania, the Republic of Serbia, and the Republic of Türkiye.