Case C-819/21, Staatsanwaltschaft Aachen: Judgment of the Court (Fourth Chamber) of 9 November 2023 (request for a preliminary ruling from the Landgericht Aachen — Germany) — Staatsanwaltschaft Aachen (Reference for a preliminary ruling — Judicial cooperation in criminal matters — Recognition of judgments imposing custodial sentences or measures involving deprivation of liberty for the purpose of their enforcement in another Member State — Framework Decision 2008/909/JHA — Article 3(4) and Article 8 — Refusal to enforce — Second paragraph of Article 47 of the Charter of Fundamental Rights of the European Union — Fundamental right to a fair trial before an independent and impartial tribunal previously established by law — Systemic or generalised deficiencies in the issuing Member State — Two-step examination — Revocation of the suspension attached to a custodial sentence imposed by a Member State — Enforcement of that sentence by another Member State)