The publication contains a review of the case law of the Court of Justice of the European Union as regards the refusal to apply a provision of the national law by a national court and the legal effects of referring a prejudicial question to the ECJ by a national court. Firstly, obligations of national organs in case of questioning the conformity of a provision of national law to the EU law are discussed, in view of the doctrine of primacy of the EU law. Secondly, the ECJ case law is presented as regards the application of interim measures by national organs. Thirdly, to a necessary degree the case law related to referring a prejudicial question by a national court is considered, particularly the prerequisites for referring a question and the effects of passing a preliminary ruling.
