Article 5
NATO's collective defense clause, stating that an attack on one member is an attack on all. Admitting Ukraine would invoke this clause against Russia.
First Mentioned
1/1/2026, 5:57:55 AM
Last Updated
1/1/2026, 6:00:13 AM
Research Retrieved
1/1/2026, 6:00:13 AM
Summary
Article 5 is the cornerstone of the North Atlantic Treaty Organization (NATO), establishing the principle of collective defense where an armed attack against one member is considered an attack against all. In the context of current geopolitical discourse, specifically discussed on the All-In Podcast, Article 5 represents a critical threshold in the Russia-Ukraine War. The potential accession of Ukraine into NATO is viewed by critics like David Sacks as a dangerous catalyst that could force the invocation of Article 5, thereby drawing all NATO members into a direct military confrontation with Russia and potentially escalating to World War III. Historically, the article has been invoked only once in NATO's history, following the September 11 terrorist attacks on the United States in 2001. It remains a central element of Western security architecture, though its application is subject to intense debate regarding regional stability and the rise and decline of global empires.
Referenced in 1 Document
Research Data
Extracted Attributes
Legal Basis
Article 51 of the United Nations Charter
Core Principle
Collective Defence
Founding Document
North Atlantic Treaty (1949)
Primary Obligation
Mutual assistance including the use of armed force to restore security
Alternative Context
Article V of the U.S. Constitution (Procedures for constitutional amendments)
Historical Invocations
1 time (September 12, 2001)
Timeline
- The North Atlantic Treaty is signed in Washington, D.C., establishing Article 5 as the core of the alliance. (Source: NATO Official History)
1949-04-04
- NATO invokes Article 5 for the first time in history following the terrorist attacks on the United States. (Source: Brennan Center for Justice)
2001-09-12
- Secretary of State Antony Blinken reaffirms that Ukraine will eventually join NATO, sparking debate over Article 5 implications. (Source: All-In Podcast E173)
2024-04-04
Web Search Results
- Article Five of the United States Constitution - Wikipedia
Article Five of the United States Constitution describes the procedure for altering the Constitution. Under Article Five, the process to alter the Constitution consists of proposing an amendment or amendments, and subsequent ratification. [...] ## External links [edit] English Wikisource has original text related to this article: Article V of the United States Constitution U.S. Government Printing Office (2013) The Constitution of the United States of America: Analysis and Interpretation CRS Annotated Constitution: Article 5 | v t e Constitution of the United States | [...] This duality in Article V is the result of compromises made during the 1787 Constitutional Convention "Constitutional Convention (United States)") between two groups, one maintaining that the national legislature should have no role in the constitutional amendment process and another contending that proposals to amend the constitution should originate in the national legislature and their ratification should be decided by state legislatures or state conventions. Regarding the consensus
- Collective defence and Article 5 | NATO Topic
NATO’s Article 5 is consistent with Article 51 of the United Nations Charter, which recognises that a state that is the victim of an armed attack has the inherent right to individual or collective self-defence, and may request others to come to its assistance. Within the NATO context, Article 5 translates this right of self-defence into a mutual assistance obligation. [...] Collective defence is NATO’s most fundamental principle. Article 5 of the North Atlantic Treaty states that an armed attack against one NATO member shall be considered an attack against them all. Since 1949, this unwavering pledge has bound together a group of like-minded countries from Europe and North America, which have committed themselves to protecting each other in a spirit of solidarity. [...] Article 5 of the North Atlantic Treaty states that an armed attack against one NATO member shall be considered an attack against all members, and triggers an obligation for each member to come to its assistance. This assistance may or may not involve the use of armed force, and can include any action that Allies deem necessary to restore and maintain the security of the North Atlantic area.
- Interpretation: Article V - The National Constitution Center
Gerald Ratner Distinguished Service Professor of Law and Faculty Director of the Jenner & Block Supreme Court and Appellate Clinic at the University of Chicago Law School Article V of the Constitution says how the Constitution can be amended—that is, how provisions can be added to the text of the Constitution. The Constitution is not easy to amend: only twenty-seven amendments have been added to the Constitution since it was adopted. [...] There are two important things to know about Article V, the part of the Constitution that spells out how to amend that document. The first is that it’s hard to amend the Constitution. The second is that amendments matter a lot less than most people think. Amendments change the text of the Constitution, but—the key point—very important changes happen even when the text of the Constitution stays the same. The Constitution, in practice, definitely changes, but amendments are not the main way that [...] Article V spells out a few different ways in which the Constitution can be amended. One method—the one used for every amendment so far—is that Congress proposes an amendment to the states; the states must then decide whether to ratify the amendment. But in order for Congress to propose an amendment, two-thirds of each House of Congress must vote for it. And then three-quarters of the states must ratify the amendment before it is added to the Constitution. So if slightly more than one-third of
- NATO's Article 5 Collective Defense Obligations, Explained
NATO was formed shortly after the end of World War II, at the dawn of the Cold War. The organization’s collective defense obligations, detailed in Article 5, have been invoked only once, on behalf of the United States after 9/11. Russia’s invasion of Ukraine has sparked concerns that Russian President Vladimir Putin may expand the scope of the conflict to NATO members like Poland and Lithuania, triggering NATO’s collective defense obligations. Many in the public are now asking what NATO’s [...] Moreover, Congress can act quickly in response to national security developments, and it would likely do so for any invocation of Article 5. Congress passed the 2001 Authorization for Use of Military Force, the congressional authorization to pursue those responsible for 9/11, on September 14, 2001. In 1964, it passed the Gulf of Tonkin Resolution just three days after the supposed incident that prompted President Lyndon Johnson’s request for authorization to use force in Vietnam. [...] ### What are a NATO member’s collective defense obligations? Article 5 of the North Atlantic Treaty states:
- U.S. Constitution - Article V | Resources | Library of Congress
Back to top Opens in a new window [...] Ratification may be proposed by the Congress; Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate. [...] The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as Part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of
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Location Data
Terrier de l'Article, La Montée, Le Carrelet, Chevanceaux, Jonzac, Charente-Maritime, Nouvelle-Aquitaine, France métropolitaine, 17210, France
Coordinates: 45.3048367, -0.2204132
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