Varga noted that the Hungarian government, acting after a preliminary position taken by lawmakers, had decided not to participate in establishing the EPPO or the cooperation strengthening process and called the issue a "matter of sovereignty.

The document establishing the EPPO does not meet the basic, principled and professional requirements such as national self-determination and full respect of the constitutional structure," she said.

Varga pointed out that Poland, Denmark, Sweden, and Ireland had also decided against joining the EPPO.