There are many discussions as to whether or not NATO demonstrated the practice of collective security through theory or practice. After September 11th, 2001 NATO was called into action and stated that an attack on one is an attack on all. Since then security across the entire US has increased in many noticeable ways, such as airport security.
Collective Security / Defense
Collective Security
To provide collective security against the Soviet Union
Both were intergovernmental military alliances created before or during the Cold War, on the principle of collective defence whereby its member states agree to mutual defense in response to an attack by any external party.
Following the war, United States and nations of Western Europe formed the collective security arrangement NATO as a way of stopping the spread of communism.
NATO's fundamental security tasks are laid down in the Washington Treaty. It is countering threats by utilising collective defence, managing crisis situations and encouraging cooperative security. NATO also embodies the transatlantic link by which security of North America is tied to that of Europe's.
The US national security authority for NATO is the Chairman of the Joint Chiefs of Staff
A regional security alliance is when several countries get together to help another country with security and military issues.
NATO
NATO stands for North Atlantic Treaty Organization and it guarantees security and freedom.
NATO uses three levels of security classification: Unclassified, Classified, and NATO Classified. Each level corresponds to the sensitivity of the information and the level of protection required.
The lessons of Munich in 1938, The Molotov-Ribbentrop (Nazi-Soviet) Pact, and Indian appeasement to the People's Republic of China in the run-up to the Sino-Indian War are textbook examples of the failing of appeasement. Collective security as evidenced by the successful NATO model instrumental to European security since its founding proved an effective deterrent to Soviet expansion into Western Europe in contrast.