The glue that held the alliance together was the collective defense provisions of Article 5 of the NATO Charter, which provides that if a NATO Ally is the victim of an armed attack, each and every other member of the Alliance will consider this act of violence as an armed attack against all members and will take the actions it deems necessary to assist the Ally attacked.
For much of the Cold War, the NATO alliance was configured militarily so that there was little doubt as to what actions would be taken, with a standing NATO army deployed in West Germany in constant combat readiness, prepared to repel any attack by the Soviet Army and its Warsaw Pact allies. Likewise, NATO maintained significant air and naval forces deployed in the Mediterranean Sea ready to confront any Soviet aggression there. These forces were anchored by a massive standing U.S. military presence comprising hundreds of thousands of troops, tens of thousands of armored vehicles, thousands of combat aircraft, and hundreds of naval vessels.
This full-time presence of concentrated combat-ready military power, prepared as it was to fight at the drop of a hat, gave the Article 5 obligation far more gravitas than it perhaps deserved. The reality of Article 5 is such that, upon its invocation, Allies can provide any form of assistance they deem necessary to respond to a situation based upon the circumstances.
While this assistance is taken forward in concert with other Allies, it is not necessarily military in nature and depends on the material resources of each country. In short, Article 5 leaves to the judgement of each individual member country to determine how and what it would contribute in the case of its invocation.
With the end of the Cold War in 1990-91 came the dismantlement of this full-time combat-ready military force. The unified nature of the NATO military component that existed in the 1980's ceased to exist barely ten years later, with each member state carrying out its own demobilization and restructuring based upon domestic political requirements, and not the requirements of the alliance.
NATO Goes on Offense
During this time NATO also watched its long-held mantra of being a purely defensive alliance fall to the side as it engaged in offensive military operations on the soil of the former Republic of Yugoslavia, and non-member, and a offensive bombing campaign against Serbia, despite Serbia not having attacked any NATO member.
This deconstruction of NATO's military capabilities and status as an exclusively defensive organization took place hand in glove with a decision by NATO to expand its membership to include the former members of the Warsaw Pact, beginning with the accession of Poland, Hungary, and the Czech Republic in 1999. The enlargement of NATO was seen as achieving two objectives from the NATO perspective, it brought most of Europe together into a single collective of allied parties who, because of their membership, would contribute to the overall stability of Europe.
But there was another perspective at play, that being that of the U.S.. While NATO responded to the U.S. invoking of Article 5 after the 9/11 attacks, providing airborne surveillance aircraft for North American patrols and naval forces in the Mediterranean Sea, several core members, led by Germany and France, balked at becoming involved in the post-9/11 military misadventures of the U.S. in Afghanistan and Iraq.
This prompted then-Secretary of Defense Donald Rumsfeld to make a quip denigrating "Old Europe" at the expense of "New Europe." The continued expansion of NATO eastwards, absorbing all of the former nations of the Warsaw Pact along with three former Soviet Republics in the Baltics not only pushed NATO's geopolitical center of gravity further east, but also put NATO on a collision course with Russia, whose opinion most NATO members had conditioned themselves to ignore.
NATO went on to provide military and police training support to Iraq in 2004, following that nation's defeat at the hands of a military coalition which included the U.S., U.K., and Poland providing combat troops, and Spain, Portugal, and the Netherlands providing political support.
Likewise, NATO contributed significant military forces to reconstruction efforts in Afghanistan. These troops operated under Article 4 authorities after the U.S. brought the Afghan situation post-9/11 to the attention of the general membership, which voted to authorize member states to deploy to Afghanistan in support of U.S. reconstruction and nation-building operations.
In 2011, NATO engaged in offensive military operations in Libya, part of a larger political campaign to remove the Libyan leader, Muammar Qaddafi, from power.
A US Adjunct
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