On 16 April 2003, NATO declared its readiness to take command of the 42-country International Security Assistance Force (ISAF). The decision was taken at the request of Germany and the Netherlands, the two main ISAF countries at the time of the agreement, and the 19 NATO ambassadors unanimously approved it. The transfer of control to NATO took place on 11 August and marked the first time in NATO`s history that it led a mission outside the North Atlantic.  The new membership of the Alliance came largely from Central and Eastern Europe, including former members of the Warsaw Pact. Alliance membership is governed by individual membership action plans and must be approved by each current member. NATO is currently a candidate for membership: Bosnia and Herzegovina. Northern Macedonia signed a NATO membership protocol in February 2019 and became a member on 27 March 2020.  Its accession had been blocked for years by Greece because of the dispute over the name of Macedonia, settled in 2018 by the Prespa agreement.  In 2003, to support each other, potential new members founded the Adriatic Charter in the region.  Georgia was also mentioned as an emerging member and was promised as a «future membership» at the Bucharest Summit in 2008 although US President Barack Obama declared in 2014 that the country «is not currently on the path to accession».  The combined wealth of U.S. non-allies, measured in terms of GDP, is greater than that of the United States.
However, non-U.S. allies together spend less than half of what the United States spends on defense. This imbalance has been constant throughout the History of the Alliance and only since the tragic events of September 11, 2001, after which the United States significantly increased its defence spending, with fluctuations. As a result, the gap between defence spending in the United States compared to Canada and European member states has widened. The Russian intervention in Crimea in 2014 led to a harsh condemnation on the part of NATO countries and the creation of a new «spearhead» of 5,000 soldiers at bases in Estonia, Lithuania, Latvia, Poland, Romania and Bulgaria.  At the next summit in Wales in 2014, NATO heads of state and government made their first official commitment to spend at least 2% of their gross domestic product on defence by 2024, which until now had only been an informal guideline.  NATO has not condemned the 2016 purges in Turkey.  NATO members opposed the UN Non-Proliferation Treaty, a binding agreement on the complete elimination of nuclear weapons negotiations, supported by more than 120 nations.  At the Wales Summit in 2014, NATO leaders agreed that each nation would spend 2% of its gross domestic product on defence by 2024. The measure was not binding and even at that time there was widespread speculation that all allied nations could one day achieve it, but the agreement was seen as a symbolic demonstration of unity immediately after the Russian invasion of Ukrainian territory. Each financial controller uses the most recent Committee on Budgets in the event of a persistent disagreement with the head of the respective NATO body over a proposed transaction. The financial controller is responsible for ensuring that all aspects of budget implementation are in line with expenditure appropriations, special controls imposed by the budget committee, and the financial rules and procedures and procedures for carrying them.
It may also, in response to the internal audit, put in place additional controls and procedures that it deems necessary to maintain accountability. NATO not only needs clear assessments to determine which forces are most needed for deterrence and defence, it needs them to address the big difference in its relative use of resources and to use its enormous superiority in resources more effectively.