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On 5 March 2026, the Court of Justice of the European Union (CJEU) delivered its judgment in the case C-150/34 (Aroja). The case arose from a request for a preliminary ruling by the Supreme Court of Finland (Korkein oikeus) regarding the calculation of detention periods for the purpose of removal of illegally staying third-country nationals under the Directive 2008/115/EC (the Return Directive).

The Court clarified that Article 15(5) and (6) of the Return Directive must be interpreted as meaning that to determine whether the maximum detention period of an illegally staying third-country national has been reached, all periods of detention completed in the same Member State under Article 15 for the purpose of enforcing the same return decision must be taken to account. To reach this conclusion, the Court noted the serious interference with the right to liberty protected by Article 6 of the Charter of Fundamental Rights and the fact that detention under the Return Directive does not have punitive aims but seeks to secure the Directive's return-related objectives within strictly defined time limits. This requirement applies even where the detention periods are separated by intervals during which the person concerned was not detained, otherwise the authorities could circumvent those limits by releasing and subsequently re-detaining the individual based on the same return decision, likely resulting in a breach of the principle of proportionality.

The Court also recalled its previous case law and held that, under the second sentence of Article 15(3) of the Return Directive, any prolonged detention exceeding the initial maximum period of detention must, in all cases, be subject to review by a judicial authority, regardless of whether the detained person has requested it.  The Court further clarified that, in the absence of EU rules on the procedure of detention reviews in the event of prolonged detention periods, the review of an administrative decision extending detention beyond the initial maximum six-month period does not have to take place before that period is reached. However, it must be carried out as speedily as possible after the adoption of that decision.

Finally, the Court held that, in the event of a late judicial review of a decision extending detention beyond the initial six-month period, EU law does not automatically require, on that ground alone, the release of the detained person. Where the substantive conditions for detention remain satisfied and the maximum period of detention under Article 15(6) of the directive has not been reached, detention may continue.