The purpose of the North Atlantic Treaty Organization (NATO) is to safeguard the freedom and security of its Alliance members by political and military means. In the military domain, the Alliance accomplishes this purpose by maintaining and developing its individual and collective ability to deter and resist armed attack, by consulting together whenever the security of one of the Alliance nations is threatened, and by defending Alliance territory and population from armed attack, as set out in Articles 3, 4, and 5 of the North Atlantic Treaty.