evidence: Court of Justice of the European Union (CJEU), the judicial branch of the European Union (EU). Its basic mission is to ensure the observance and uniform application and interpretation of EU law within EU member states and institutions. Its headquarters are in Luxembourg. [...] The Court of Justice issues rulings on the interpretation of EU law for national courts of EU member states and hears various actions involving member states and institutions, including actions brought by the European Commission or by a member state for failure of a member state to fulfill its obligations under EU law; actions brought by a member state against the European Parliament or the European Commission, or by one EU institution against another, seeking annulment of a regulation, directive, or decision; and appeals on points of law of judgments of the General Court. The General Court hears actions involving member states, institutions, and natural or legal persons, including actions brought by natural or legal persons against EU institutions for failure to act in accordance with EU law or brought by them to seek annulment of a regulation, directive, or decision; actions brought by a member state against the European Commission; and various actions against EU institutions concerning specific issues, such as state aid, trade, intellectual property, or employment relations.