Germany and Poland staged festivities in twin towns on their shared border to mark the 20th anniversary of Poland’s accession to the European Union. German Foreign Minister Annalena Baerbock and Polish Foreign Minister Radosław Sikorski met in Frankfurt an der Oder and Słubice on Wednesday. The two visited Słubice’s Collegium Polonicum academic institution on the Polish side, then joined a festival and crossed the Oder Bridge to Frankfurt an der Oder in Germany. Baerbock called May 1, 2004, an “incredible moment” for the continent. On that day, the former Eastern Bloc states of Estonia, Latvia…