The CIS countries' EU-related interests are very heterogeneous. The countries themselves differ not only in terms of their geopolitical and geo-economic situations, and how those affect their relations with the EU, but also in their levels of ambition in relation to the Union, as well as their specific sectoral interests. Some Eastern Partners have set full EU membership as their strategic goal; others want to enjoy the benefits of the common free market, and the ambitions of others are limited to developing cooperation in selected areas. Similarly, the EU's policy towards its Eastern neighbourhood is multi-level and very diverse, considering as it must the different characters of mutual relations. The EU and most of its Eastern partners have a sufficient number of common or converging interests to expect reasonable cooperation between the two sides to develop and deepen. However, serious challenges and problems exist that may prevent this positive scenario from being realised.