The article examines the problematic aspects of recognition and enforcement of foreign judgments in the European Union in relation to the application of the public policy clause. Analysis of the content of public order also constitutes part of the article. It focuses on the EU law instruments which provide unequal conditions for non-recognition of foreign judgments. The authors discuss if inclusion in the CJEU of the limits on the interpretation of the public order clause is a sufficient guarantee to ensure proper application of the public order clause. Moreover, the authors analyse the principle of res judicata according the EU law.