The signing of the Treaty on Croatia’s Accession to the EU points to the continuation of the enlargement process; and after the referendum in Croatia, Poland should take action to smoothly ratify the document. Although the addition of conditions for Serbia and Montenegro provides proof of the Union’s more rigorous approach to the European integration of the Western Balkan countries at an early stage of this process, Poland should continue to actively support the aspirations of the other states of the region. Decisions to open accession negotiations with Montenegro and to grant Serbia candidate status for membership may still be taken in the first half of 2012.