BERLIN -- Boris Romantschenko, who survived detention in four Nazi concentration camps in the 1940s, was killed last week when a Russian missile struck his apartment building in Kharkiv, Ukraine, according to a foundation that preserves the memory of Nazi crimes. "It is with horror that we report the violent death of Boris Romantschenko in the war in Ukraine," read a statement on the website of the Buchenwald and Mittelbau-Dora Memorials Foundation. The foundation said it learned of the 96-year-old man's death from his son and granddaughter. Romantschenko's "horrific death," the statement said, "shows how threatening the war in Ukraine...