Bedingungen Russlands für die Rückgabe der noch fehlenden sechs Glasfenster aus der Marienkirche Frankfurt/Oder (G-SIG: 16050582)

This question asks about the conditions Russia has set for returning six stained-glass windows that belong to St. Mary's Church in Frankfurt (Oder). These windows were taken by Soviet troops in 1945. The question seeks to understand the diplomatic efforts and potential agreements being pursued to secure the return of these cultural artifacts to Germany.