Judgment of the Court (Grand Chamber) of 22 December 2022.#Generalstaatsanwaltschaft München v S.M.#Request for a preliminary ruling from the Oberlandesgericht München.#Reference for a preliminary ruling – Citizenship of the European Union – Articles 18 and 21 TFEU – Request sent to a Member State by a third State for the extradition of a Union citizen who is a national of another Member State and who has exercised his right to free movement in the first of those Member States – Request made for the purpose of enforcing a custodial sentence – Prohibition on extradition applied solely to own nationals – Restriction of freedom of movement – Justification based on the prevention of impunity – Proportionality.#Case C-237/21.