If it is to achieve its goal of secure, competitive and sustainable energy the EU must involve and cooperate with other countries, be they producers, transit countries or consumers. For the sake of efficiency and consistency, the EU and the Member States must speak with one voice on international energy issues. At a time of vulnerability of imports, potential energy crises and uncertainty surrounding future supplies, the EU must make sure that it adopts measures and creates partnerships that guarantee the security of its energy supply. With regards to enlargement compliance with the Community energy acquis by the candidate countries is a vital part of the process of their accession to the EU.