20It is important at the outset to bear in mind that Directive 2008/115 concerns only the return of illegally staying third-country nationals and is thus not designed to harmonise in their entirety Member State rules on the stay of foreign nationals. Therefore, that directive does not preclude, in principle, the law of a Member State from classifying the unlawful re-entry of a third-country national in breach of an entry ban as an offence and laying down criminal law sanctions to deter and penalise such an infringement (see, by analogy, judgments in Achughbabian, C‑329/11, EU:C:2011:807, paragraph 28, and Sagor, C‑430/11, EU:C:2012:777, paragraph 31).
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