Poland's Prime Minister Ewa Kopacz, center ,left former Polish foreign minister Wladyslaw Bartoszewski, center, and German Chancellor Angela Merkel , center right, pose for a group photo with Polish students during a visit of an exhibition to commemorate 25 years since a symbolic reconciliation between the two neighboring nations whose ties were marked by warfare in Krzyzowa, Poland, Thursday Nov. 20, 2014 . Speaking on the occasion, Merkel stressed that security, freedom and the rule of law are made even more valuable today, when Ukraine's territorial integrity has been violated. "We are aware that only together with Russia we can assure Europe's long-term security," Merkel said.(AP Photo/Czarek Sokolowski)