(ANSA) - BELGRADE, DEC 17 - "Europe must take responsibility for its own security. This is no longer an option. It is an obligation. We know the threats we face, and we will address them. This means we must be ready. We must develop and deploy new capabilities to fight a modern hybrid war. Here too, we are moving mountains," said European Commission President Ursula von der Leyen, speaking at the Strasbourg plenary session ahead of the EU Council. (ANSA).