Poland's Prime Minister Donald Tusk (L), Poland's Defence Minister Tomasz Siemoniak (2nd L), his French counterpart Jean-Yves Le Drian and General Lech Majewski (R) attend a ceremony marking the 75th anniversary of Nazi Germany's invasion of Poland at the World War Two Westerplatte Memorial in Gdansk September 1, 2014. REUTERS/Kacper Pempel (POLAND - Tags: POLITICS CONFLICT ANNIVERSARY)