A hard truth in Munich: Cyber defense runs through Silicon Valley MUNICH, Germany — At the Munich Cyber Security Conference on Thursday, amid the usual talk of deterrence and digital battlefields, something quieter, and more revealing, slipped into the room. The next arena of political conflict, the speakers suggested, won’t be defined by borders or territory. It will be written in code. And much of that code isn’t controlled by governments at all — it belongs to American companies. Onstage were two men who have spent their careers thinking about power in its most muscular forms: Paul Nakasone, the former head of U.S. Cyber Command and the National Security Agency, and Dag Baehr of Germany’s foreign intelligence service, the Bundesnachrichtendienst. Although the panel was billed as a…