In view of geopolitical tensions and a changing security architecture, the question of European defense is coming into focus. The Franco-German Strategic Dialogue asks: Can and does France want to play a key role in Europe's security with its nuclear arsenal? The idea of a European nuclear umbrella under French leadership - as a supplement or alternative to NATO - will be discussed. How realistic is such a strategy? What are the political, legal and strategic hurdles? Germany's stance on a possible paradigm shift in security policy is also a topic. And: Can Europe's defensiveness be compatible with global disarmament goals?