There were a lot of ghosts at this year’s Munich Security Conference. The proceedings opened with the news of Russian opposition leader Alexey Navalny’s death in a penal colony far above the Arctic Circle. His wife, Yulia Navalnaya, now widowed, was squeezed into a speaking slot right after Vice President Kamala Harris to address the notables gathered there: heads of state, defense departments, and foreign ministries; 47 spy chiefs; parliamentarians and four dozen members of the U.S. Congress; as well as diplomats, activists, journalists, think-tankers, and various hangers-on. Yulia’s speech astonished the conference. “How strong do you have to be?” mused Christoph Heusgen, Angela Merkel’s former national security adviser and now head of the M.S.C. “Your husband was just killed and you get up and kick Putin in the face?”