The Kaliningrad region of the Russian Federation with a population of almost one million inhabitants became the only enclave within the EU as a consequence of the 2004 EU enlargement.
Venemaa Föderatsiooni Kaliningradi oblastist oma ligi miljonilise elanikkonnaga sai ELi 2004. aasta laienemise tulemusel ELi ainus enklaav.