NIS2 Recital 67

The competent authorities and the CSIRTs should be able to participate in exchange schemes for officials from other Member States, within a specific framework and, where applicable, subject to the required security clearance of officials participating in such exchange schemes, in order to improve cooperation and strengthen trust among Member States. The competent authorities should take the necessary measures to enable officials from other Member States to play an effective role in the activities of the host competent authority or the host CSIRT.