# NATO (North Atlantic Treaty Organization) > The 32-member military alliance anchored in Brussels that binds North America and Europe to collective defence, now facing its sharpest internal tensions since the Cold War. **Meta:** type: reference · date: 2026-07-03 · heads: · 3 takes · 1 lenses · 1 regions ## What it is NATO, the North Atlantic Treaty Organization, is a political and military alliance of 32 countries from North America and Europe. Its legal foundation is the North Atlantic Treaty, signed in Washington, D.C., on April 4, 1949. The treaty's central provision is Article 5, which declares that an armed attack against one member is considered an attack against all, obligating collective defence. Headquarters are in Brussels, Belgium. The current Secretary General, since October 2024, is the Netherlands' Mark Rutte, who succeeded Jens Stoltenberg. Decisions require consensus of all members. ## History NATO was founded by 12 countries: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States. The Cold War drove its formation as a counterweight to Soviet military power in Europe. The alliance has expanded in 10 rounds. The first four brought in Greece and Turkey (1952), West Germany (1955), Spain (1982), and the former Eastern Bloc states of Poland, Hungary, and Czechia (1999). Post-Soviet enlargement continued in 2004 (the Baltic states, Bulgaria, Romania, Slovakia, Slovenia), 2009 (Albania, Croatia), 2017 (Montenegro), 2020 (North Macedonia). Russia's full invasion of Ukraine in February 2022 catalysed the two most recent additions: Finland (April 2023) and Sweden (March 2024), bringing total membership to 32. The 2014 Wales Summit codified a 2% of GDP spending benchmark that most European members ignored for years. At the 2025 Hague Summit, all 32 members formally pledged to reach 5% of GDP by 2035, split as at least 3.5% for core defence and up to 1.5% for broader security-related investment. ## Current state As of mid-2026, combined NATO defence spending exceeds US$1.4 trillion annually. For the first time since the Wales benchmark was set, all 32 members met or exceeded 2% of GDP in 2025. European allies and Canada collectively invested US$571 billion, a nearly 20% real-terms increase over 2024. The United States contributed US$838 billion, roughly 55% of the total. Poland (4.3%), Lithuania (4%), and Latvia (3.74%) already exceed the new 3.5% core-defence target. Structural tensions dominate mid-2026. After the US-led Iran war ended in a ceasefire, President Trump publicly accused NATO allies of letting the United States down by not contributing combat forces. At a June 25 White House meeting, [Trump told Secretary General Rutte](/en/n/trump-rutte-nato-iran-jun25) he was "let down" by European members; Rutte countered that 4,000 to 5,000 US aircraft operated from European bases during the campaign. Heading into the [July 7-8 Ankara summit](/en/n/nato-ankara-summit-jul2-preview), Italy has blocked summit-declaration language committing to Ukraine aid beyond 2026, leaving a key paragraph in brackets, as reported in [Italy blocks NATO draft language pledging to sustain Ukraine aid at 2026 levels in 2027](/en/n/italy-nato-ukraine-2027-aid-block). Russia, meanwhile, suspended all rail crossings with Finland, Estonia, and Latvia without explanation on July 1, a development covered in [Russia suspends all railway crossings with Finland, Estonia and Latvia without explanation](/en/n/russia-nato-rail-closure-jul1). The UK, which committed £298 billion to defence over four years per [UK commits nearly £300 billion to defence over four years, targeting 2.7% of GDP by 2028 and 3.5% by 2035](/en/n/uk-defence-investment-jun30), is on track to become Europe's largest per-capita military spender by 2028. ## Relationships Russia remains the primary threat that animates NATO's collective planning, though the alliance's southern flank increasingly tracks Iran and the Middle East. Ukraine applied for membership at the 2023 Vilnius Summit; allies bridged a US-European split by acknowledging Ukraine's future membership without setting a timeline. Ukraine's President Zelensky was invited as an observer to the Ankara summit, pending agreement on a declaration that as of July 3 remained unresolved on Ukraine aid language. Turkey, a NATO member since 1952 and the alliance's only majority-Muslim state, controls the Bosphorus and Dardanelles straits under the 1936 Montreux Convention; Ankara has conditioned summit alignment on EU defence-fund access, as tracked in [EU's Kallas and two commissioners hold talks in Ankara ahead of NATO summit, seeking to reset Turkey ties](/en/n/kallas-turkey-nato-ankara-prep-jun29). ## What to watch The Ankara summit on July 7-8, the first ever held in Turkey, will test whether allies can agree on a Ukraine aid commitment through 2027, resolve Turkey's demand for access to the EU's €150 billion SAFE defence fund, and set credible timelines for the 3.5% spending floor. If the declaration fails on Ukraine language, it would mark the first time a NATO summit produced no agreed commitment on an active European security crisis. Longer term, the alliance faces a structural question: whether European rearmament proceeds fast enough to reduce dependence on US capabilities before Washington's domestic politics render that dependence a liability. ## Regional takes (batched by bias / lens) ### official record - **NATO** (International, en) — NATO's official membership history page documenting the 12 founding members, all 10 enlargement rounds from 1952 to 2024, and the Article 5 collective defence commitment. Source: https://www.nato.int/cps/en/natohq/topics_52044.htm - **NATO** (International, en) — Official NATO page on the Hague Summit 2025 agreement to reach 5% of GDP by 2035, the 3.5%/1.5% split, European allies exceeding 2.3% of GDP collectively in 2025, and the prior 2014 Wales 2% pledge. Source: https://www.nato.int/en/what-we-do/introduction-to-nato/defence-expenditures-and-natos-5-commitment - **NATO** (International, en) — NATO funding explainer: civil budget of €528m, military budget of €2.42bn, and NSIP ceiling of €2.2bn for 2026; cost-sharing formula derived from each member's gross national income. Source: https://www.nato.int/en/what-we-do/introduction-to-nato/funding-nato ## Across the graph - Related: [[nato-ankara-summit-jul2-preview]], [[italy-nato-ukraine-2027-aid-block]], [[russia-nato-rail-closure-jul1]], [[uk-defence-investment-jun30]], [[kallas-turkey-nato-ankara-prep-jun29]], [[trump-rutte-nato-iran-jun25]] - Entities: NATO Alliance, Mark Rutte, Person:donald Trump, Ukraine, Erdogan, Defence Spending Surge --- Canonical: https://rbtfl.xyz/en/n/nato-alliance-dossier