War on terror
International military support

The invasion of Afghanistan is seen to have been the first action of this war, and initially involved forces from the United States, the United Kingdom, and the Afghan Northern Alliance. Since the initial invasion period, these forces were augmented by troops and aircraft from Australia, Canada, Denmark, France, Italy, Netherlands, New Zealand and Norway among others. In 2006, there were about 33,000 troops in Afghanistan.

On 12 September 2001, less than 24 hours after the 11 September attacks in New York City and Washington, D.C., NATO invoked Article 5 of the North Atlantic Treaty and declared the attacks to be an attack against all 19 NATO member countries. Australian Prime Minister John Howard also stated that Australia would invoke the ANZUS Treaty along similar lines.

In the following months, NATO took a broad range of measures to respond to the threat of terrorism. On 22 November 2002, the member states of the Euro-Atlantic Partnership Council (EAPC) decided on a Partnership Action Plan against Terrorism, which explicitly states, " EAPC States are committed to the protection and promotion of fundamental freedoms and human rights, as well as the rule of law, in combating terrorism." NATO started naval operations in the Mediterranean Sea designed to prevent the movement of terrorists or weapons of mass destruction as well as to enhance the security of shipping in general called Operation Active Endeavour.

Support for the U.S. cooled when America made clear its determination to invade Iraq in late 2002. Still, many of the "coalition of the willing" countries that unconditionally supported the U.S.-led military action have sent troops to Afghanistan, particular neighboring Pakistan, which has disowned its earlier support for the Taliban and contributed tens of thousands of soldiers to the conflict. Pakistan was also engaged in the Insurgency in Khyber Pakhtunkhwa (a.k.a. Waziristan War or North-West Pakistan War). Supported by U.S. intelligence, Pakistan attempted to remove the Taliban insurgency and al-Qaeda element from the northern tribal areas.
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