This memo discusses the implications of the current crisis in Russian-Ukrainian relations for the Baltic Sea region (BSR), for many years considered one of the greatest success stories of regional integration in Europe. The Ukraine crisis has seriously challenged regional institutions and practices in which the region’s states have invested heavily. Two major questions loom. First, given the profound conflict between Russia and the European Union, can regional institutions play a role in building a united Europe without dividing lines? Second, to what extent is Russia interested and capable of fitting into the regional milieu?