Case C-930/19: Judgment of the Court (Grand Chamber) of 2 September 2021 (request for a preliminary ruling from the Conseil du contentieux des étrangers — Belgium) — X v Belgian State (Reference for a preliminary ruling — Directive 2004/38/EC — Article 13(2) — Right of residence of family members of a Union citizen — Marriage between a Union citizen and a third-country national — Retention, in the event of divorce, of the right of residence by a third-country national who is the victim of acts of domestic violence committed by his or her spouse — Requirement to demonstrate the existence of sufficient resources — No such requirement in Directive 2003/86/EC — Validity — Charter of Fundamental Rights of the European Union — Articles 20 and 21 — Equal treatment — Difference in treatment based on whether the sponsor is a Union citizen or a third-country national — Non-comparability of situations)