​This volume explores the bilateral treaties concluded after 1990 between the Republic of Poland and its neighbouring states (Germany, then-Czechoslovakia, Ukraine, the Russian Federation, Belarus and Lithuania), known as treaties on neighbourly relations or good neighbourhood treaties. These treaties, through which Poland and its neighbours were able to establish their political, security and social relations, were extremely significant in that they provided a unique way for them to organise their interstate post-Cold War relations. This book analyses the consequences of these treaties and addresses a variety of issues, including security policy and cooperation, migration, national minority rights, economic cooperation, education, and cross-border cooperation.