This thesis argues that the transmission of the European Union’s norms and values to Poland, and then to Lithuania and Ukraine, has helped those countries to better manage their relations. As a result of their integration into the EU and other western structures, relations between Poland and Lithuania have become more “normal”. The introduction of EU-mandated border controls has complicated relations between Poland and both Ukraine and Belarus. Poland has deep historic ties with Ukraine and is determined to ensure that Ukraine is offered a pathway that will lead to its eventual integration with Europe. However, relations between Poland and Belarus have worsened. Included in this thesis are the results and analysis of interviews and surveys carried out in Poland, Lithuania and Ukraine in 2008.