62By virtue of those standards and procedures, such a third-country national must be the subject of a return procedure, the order of whose stages corresponds to a gradation of the measures to be taken in order to enforce the return decision and which permits, so far as concerns deprivation of liberty, at the very most detention in a specialised facility, a measure which is, however, strictly regulated, pursuant to Articles 15 and 16 of Directive 2008/115, in order to ensure observance of the fundamental rights of the third-country nationals concerned (see, in particular, judgment of 28 April 2011 in El Dridi, C‑61/11 PPU, EU:C:2011:268, paragraphs 41 and 42).
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