What Happened
- The US administration indicated it is "absolutely" considering withdrawing from NATO, with the President calling the alliance a "paper tiger" and criticising European allies for refusing to join US military operations against Iran.
- The demand has escalated from the original 2% of GDP defence spending target (set at the 2014 Wales Summit) to 5% of GDP, with threats to strip Article 5 protections from non-compliant members.
- The US contributes approximately 60% of NATO's total $1.404 trillion defence expenditure, and this disproportionate burden-sharing has been a longstanding point of friction.
Static Topic Bridges
North Atlantic Treaty Organisation (NATO)
NATO is a political and military alliance established on 4 April 1949 through the signing of the North Atlantic Treaty (also called the Washington Treaty) by 12 founding members: the US, Canada, UK, France, Belgium, the Netherlands, Luxembourg, Denmark, Iceland, Italy, Norway, and Portugal. Its primary purpose is collective defence against armed aggression. The alliance has grown from 12 to 32 members.
- Article 5 enshrines the principle of collective defence — an armed attack against one ally is considered an attack against all. It has been invoked only once, after the 9/11 attacks in 2001.
- Article 13 provides the withdrawal mechanism — a member must send a "notice of denunciation" to the US (as the depositary state), with withdrawal taking effect after a one-year waiting period.
- At the 2014 Wales Summit, allies pledged to spend at least 2% of GDP on defence by 2024. At the June 2025 Hague Summit, allies committed to 5% of GDP by 2035, split into 3.5% on core defence and 1.5% on infrastructure and civil preparedness.
Connection to this news: The US threat to exit NATO and strip Article 5 guarantees from low-spending members directly challenges the treaty's foundational principle that collective defence is unconditional and consensus-based.
US Congressional Constraints on Treaty Withdrawal
In 2023, the US Congress enacted Section 1250A of the National Defense Authorization Act (NDAA) for Fiscal Year 2024, expressly prohibiting the President from unilaterally withdrawing from NATO. The provision was sponsored by Senator Tim Kaine (D-Virginia) and Senator Marco Rubio (R-Florida). It requires either two-thirds Senate approval or an Act of Congress before any withdrawal, suspension, or denunciation of the treaty can proceed.
- The provision bars the use of any appropriated funds for withdrawal without congressional authorisation.
- This was the first statute in US history explicitly prohibiting a President from unilaterally exiting a Senate-approved treaty.
- The constitutional question of whether treaty withdrawal is a presidential or congressional prerogative remains legally contested.
Connection to this news: Even as the executive branch signals willingness to exit NATO, the 2023 NDAA provision creates a significant legal barrier, making unilateral withdrawal virtually impossible without bipartisan congressional support.
Burden-Sharing in Military Alliances
Burden-sharing refers to the distribution of costs, risks, and responsibilities among alliance members. In NATO's context, it has been a persistent source of tension since the Cold War, with the US consistently accounting for over 60% of total alliance spending. The concept raises fundamental questions about free-riding in collective security arrangements.
- In 2014, only 3 of 28 NATO allies met the 2% GDP target; by 2025, all allies were expected to meet it.
- The US spent approximately 3.4% of GDP on defence in 2025, while many European allies spent between 1.5% and 2.5%.
- The push for 5% would require most European nations to more than double their current defence budgets, a fiscal challenge that could strain social welfare spending.
Connection to this news: The escalating spending demands — from 2% to 5% — reflect a broader shift in US policy from encouraging allied self-sufficiency to using financial thresholds as conditions for security guarantees.
Key Facts & Data
- NATO was founded on 4 April 1949 with 12 members; it now has 32 members.
- Article 5 has been invoked only once in NATO history — after the 11 September 2001 attacks.
- The US accounts for approximately 60% of NATO's total defence expenditure.
- Section 1250A of the US NDAA FY2024 requires two-thirds Senate approval or an Act of Congress for NATO withdrawal.
- The June 2025 Hague Summit set a new target of 5% of GDP on defence-related spending by 2035.