Case C-97/17: Judgment of the Court (Second Chamber) of 26 April 2018 — European Commission v Republic of Bulgaria (Failure of a Member State to fulfil obligations — Protection of nature — Directive 2009/147/EC — Conservation of wild birds — Special Protection Area (SPA) — Classification as SPAs of the most suitable territories in number and size for the conservation of the bird species listed in Annex I to Directive 2009/147 — Important Bird Area (IBA) — IBA Rila — Partial classification of IBA Rila as an SPA)