Germany and Poland are staging 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 are to meet in Frankfurt an der Oder and Słubice on Wednesday.
The two are due to visit Słubice's Collegium Polonicum academic institution on the Polish side on Wednesday, starting at 11:30 am (0930 GMT), then join a festival and cross the Oder Bridge to the German city of Frankfurt an der Oder.
At the time, former German foreign minister Joschka Fischer and his then counterpart Wlodzimierz Cimoszewicz ushered in the new era of partnership on the bridge in 2004, shaking hands at midnight, with the moment welcomed by thousands of people cheering.
Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia all joined the EU 20 years ago, in the largest enlargement in the history of the EU.
Later, Baerbock and Sikorski are to address students at the European University Viadrina in Frankfurt an der Oder
Poland and other former Soviet satellites are celebrating the anniversary of their EU accession against the backdrop of war, with Russia's full-scale invasion of Ukraine well into its third year.
The events also hold particularly significance for Berlin and Warsaw, as Germany's attack on Poland in September 1939 launched World War II.