Jack Mandelbaum, a Holocaust survivor from the Polish city of Gdynia, poses in front of a photograph showing him as a youth. Tobias Schwarz/AFP/Getty Images hide caption

itoggle caption Tobias Schwarz/AFP/Getty Images

Swedish navy corvette HMS Visby patrols in the Stockholm Archipelago, Sweden, in October. The Swedish military was searching for evidence of suspected undersea activity in its waters amid reports of a Russian submarine intrusion. Marko Saavala/TT News Agency/AP hide caption

itoggle caption Marko Saavala/TT News Agency/AP

Ukraine's president Petro Poroshenko speaks at a meeting of the National Security and Defense Council (NSDC) of Ukraine on Sunday. Mykola Lazarenko/ITAR-TASS/Landov hide caption

itoggle caption Mykola Lazarenko/ITAR-TASS/Landov