1. The EES shall be operated at the external borders.
2. The Member States which apply the Schengen acquis in full shall introduce the EES at their internal borders with Member States which do not yet apply the Schengen acquis in full but operate the EES.
3. The Member States which apply the Schengen acquis in full and the Member States which do not yet apply the Schengen acquis in full but operate the EES shall introduce the EES at their internal borders with the Member States which do not yet apply the Schengen acquis in full and do not operate the EES.
4. Member States which do not yet apply the Schengen acquis in full but operate the EES shall introduce the EES at their internal borders as defined under points (b) and (c) of Article 2(1) of Regulation (EU) 2016/399.
5. By way of derogation from the third and fourth subparagraphs of Article 23(2) and from Article 27, a Member State which does not yet apply the Schengen acquis in full but operates the EES shall introduce the EES without biometric functionalities at its internal land borders with a Member State which does not yet apply the Schengen acquis in full but operates the EES. Where, at those internal borders, a third-country national has not yet been registered in the EES, that third-country national’s individual file shall be created without recording biometric data. Biometric data shall be added at the next border crossing point where the EES is operated with biometric functionalities.