Police on Sunday rolled up a giant Ukrainian flag displayed by demonstrators at a Soviet War Memorial in central Berlin, saying it was to ensure that a WWII commemoration ceremony stayed peaceful. Berlin police have imposed a ban on displays of flags or military symbols at 15 memorial sites across the capital, including at the iconic site at the central Tiergarten park and another in Treptower Park. Germany has already outlawed the display of the “Z” symbol used by the Russian army in their invasion of Ukraine. Berlin: A group unfurls a large #Ukraine flag, the police intervene and remove the …