The North Atlantic Treaty Organization (NATO)
NATO is a military alliance among 28 member countries. Numerous other countries also participate in NATO programs to promote peace and international dialogue. Member nations agree to provide collective support to member nations in the event of attack by non-member nations. NATO also provides a judicial system for adjudicating breaches of international peace, known as the International Court of Justice.
⁃ Note: Member nations must be accepted by the NATO body and meet certain defense spending and capability requirements.