Case C-626/18: Judgment of the Court (Grand Chamber) of 8 December 2020 — Republic of Poland v European Parliament, Council of the European Union (Action for annulment — Directive (EU) 2018/957 — Freedom to provide services — Posting of workers — Terms and conditions of employment — Remuneration — Duration of posting — Determination of the legal basis — Articles 53 and 62 TFEU — Amendment of an existing directive — Article 9 TFEU — Principle of non-discrimination — Necessity — Principle of proportionality — Regulation (EC) No 593/2008 — Scope — Road transport — Article 58 TFEU)