Polish President Karol Nawrocki on Monday called for Germany to pay war reparations for its invasion and occupation of the country during World War II, reported dpa. Speaking in Gdańsk at the annual commemoration of the September 1, 1939 invasion for the first time since his inauguration last month, Nawrocki said the issue of reparations must be settled to ensure a partnership with Germany based on truth and good relations. "As a frontline country, as the most important country on NATO's eastern flank, Poland needs justice, truth and clear relations with Germany, but it also needs reparations from the German state," he said in an address at the Westerplatte Monument war memorial. Demands for war reparations from Germany have been raised repeatedly by Poland's opposition Law and Justice (PiS) party, which supported the conservative Nawrocki's election campaign. According to the PAP news agency, Nawrocki called on the Polish government - led by centrist Prime Minister Donald Tusk - to back his demands for reparations. The issue has been a thorn in the side for Polish-German relations in recent years, with Berlin taking the view that the matter was settled in the treaties resulting in the reunification of Germany in 1990. The Westerplatte Monument marks the site of one of the first battles in Nazi Germany's invasion of Poland, which sparked World War II. A German warship fired on a Polish military outpost on the Westerplatte peninsula in the harbour of Gdańsk, then called Danzig. Polish forces defended the outpost against overwhelming force for seven days.