More than 60 years after the end of World War II, disputes over war booty rage on as Germany seeks, with mixed success, the return of treasures looted by the victorious Red Army.

Late last month, Russia handed over six medieval stained glass church windows -- the last of a set of 117 panes from the Marienkirche (St Mary's Church) in Frankfurt an der Oder, on today's Polish border, carted off to Moscow in 1945.

At a ceremony to mark the occasion, German Culture Minister Bernd Neumann said the restitution was a sign of improving relations between the wartime foes.