This article aims to compare transformative power of European Union (EU) through its enlargement policy and European Neighbourhood Policy (ENP). Their goals, instruments and influences on a candidate country (Turkey) and an eastern neighbour of the EU (Ukraine) are compared. Because of the membership perspective, Europeanization through the accession process is much more influential than Europeanization of neighbourhood of EU through ENP. There has been interplay of domestic and external factors which have influenced transformative power of EU on Turkey and Ukraine.
Keywords: European Union (EU), European Neighbourhood Policy (ENP), EU Enlargement, Conditionality, Orange Revolution