NATO
New membership in the alliance has been largely from Central and Eastern Europe, including former members of the Warsaw Pact. Accession to the alliance is governed with individual Membership Action Plans, and requires approval by each current member. NATO currently has two candidate countries that are in the process of joining the alliance: Bosnia and Herzegovina and the Republic of Macedonia.
In NATO official statements, the Republic of Macedonia is always referred to as the "former Yugoslav Republic of Macedonia", with a footnote stating that "Turkey recognizes the Republic of Macedonia under its constitutional name". Though Macedonia completed its requirements for membership at the same time as Croatia and Albania, who joined NATO in 2009, its accession was blocked by Greece pending a resolution of the Macedonia naming dispute. In order to support each other in the process, new and potential members in the region formed the Adriatic Charter in 2003. Georgia was also named as an aspiring member, and was promised "future membership" during the 2008 summit in Bucharest, though in 2014, US President Barack Obama said the country was not "currently on a path" to membership.
History of NATO
In 2009, US President Barack Obama proposed using the ship-based Aegis Combat System, though this plan still includes stations being built in Turkey, Spain, Portugal, Romania, and Poland. NATO will also maintain the "status quo" in its nuclear deterrent in Europe by upgrading the targeting capabilities of the "tactical" B61 nuclear bombs stationed there and deploying them on the stealthier Lockheed Martin F-35 Lightning II. Following the 2014 annexation of Crimea by Russia, NATO committed to forming a new "spearhead" force of 5,000 troops at bases in Estonia, Lithuania, Latvia, Poland, Romania, and Bulgaria.
The Russian intervention in Crimea in 2014 lead to strong condemnation by NATO nations, and Poland invoked Article 4 meetings. At the subsequent 2014 Wales summit, the leaders of NATO's member states formally committed for the first time spend the equivalent of at least 2% of their gross domestic products on defence by 2024, which had previously been only an informal guideline. In 2015, five of its 28 members met that goal. At the beginning of 2018, eight of the 29 members either were meeting the target or were close to it; six others had laid out plans to reach the target by 2024 as promised; and Norway and Denmark had unveiled plans to substantially boost defense spending (including Norway's planned purchase 52 new F-35 fighter jets.