NATO 2009 Summit represented an historical occasion for celebrating the Alliance’s 60th Anniversary and for reflecting over the XXI Century’s threats and challenges that NATO has to tackle. Afghanistan remains a crucial test for NATO and recent troops increase demonstrate Alliance solidarity and long term commitment to the country. The indivisibility of Euro-Atlantic security requires the Alliance to meet the threats and challenges of the XXI century: terrorism, proliferations of weapons of mass destruction, cyber attacks. Energy security, climate changes and failed states may have a negative impact as well. NATO open door policy has been reaffirmed for those countries who contribute to international peace and security. Cooperation with other international actors, UN, EU, Russian Federation and partner countries is defined as indispensable. Albania and Croatia joining of NATO shows the development that Western Balkans have undergone and testify the chances for further Euro-Atlantic integration. NATO’s Defense Planning process must enable Allies to deliver more deployable, sustainable, interoperable and thus usable forces.