Europe's collective defense still relies on the NATO trans-Atlantic alliance, the EU's top diplomat told the Munich Security Conference on Sunday. But there is an urgent need, Kaja Kallas said, for Europe to take the lead in its own defense. Kallas, the European Commission's  high representative for foreign affairs and security policy, channeled the Avengers superhero franchise with her address, titled "Europeans Assemble! Reclaiming Agency in a Rougher World." She singled out Russia as Europe'