Donald Trump stands on the precipice of an unprecedented decision: withdrawing the United States from the North Atlantic Treaty Organization (NATO), a move that would undoubtedly trigger a profound political upheaval in the Western security framework. Established in the wake of the Second World War and resilient through the Cold War, NATO expanded after the fall of communism in Eastern Europe in 1989. Founded in 1949 with an initial dozen members, including the US, Britain, France, Canada, and Denmark, the alliance now boasts 32 countries.

NATO, formally known as the North Atlantic Treaty Organization, was conceived to act as a bulwark against what was perceived as aggressively expansionist Soviet communism. Beyond this immediate threat, its formation was rooted in the historical understanding that a lack of collective security had failed to deter Adolf Hitler's territorial annexations in the 1930s, prior to the Second World War. The cornerstone of NATO's existence is its principle of collective security, articulated in Article 5 of its charter. This article stipulates that an armed attack against one member is to be considered an attack against all. Despite fears during the Cold War, this scenario never materialized. The only instance Article 5 was ever invoked was following the al-Qaida terror attacks on New York and Washington on September 11, 2001, which led to alliance members deploying troops to Afghanistan in support of the US-led military operation.

Trump's contemplation of withdrawal stems from a variety of grievances, primarily his indignation over NATO's refusal to support or aid the US in its conflict against Iran. However, NATO's charter does not obligate members to intervene in such conflicts, especially when the US itself was not directly attacked and did not consult its allies beforehand. Trump has publicly expressed his strong opinions on the alliance, famously labeling it a “paper tiger” and stating that withdrawing the US from membership was “beyond reconsideration,” implying a definitive decision. He has frequently reiterated that NATO would not defend the US in the same manner the US protects Europe, citing the lack of support for the Iran war and European inaction regarding the Strait of Hormuz. This assertion, however, is contradicted by NATO's significant support during the lengthy war in Afghanistan.

A deeper animosity towards NATO appears to motivate the former president. In 2017, he dismissed the organization as “obsolete” and accused its European members of “ripping off” the US by failing to adequately contribute to their defense budgets. More recently, in 2024, Trump escalated his threats, indicating he would encourage Russia to do “whatever the hell they want” to any European nation that did not meet his defense spending requirements. His confrontational stance was evident as recently as January when NATO members went on alert following his threat to annex Greenland, a plan he eventually receded from, though many believe his 'Greenland fixation' remains active.

Trump's persistent criticisms have undeniably influenced European leaders, who have made concerted efforts to appease him. Last June, NATO members collectively agreed to elevate their defense spending target to 5% of GDP by 2025, a significant increase from a decade prior when some struggled to meet a lower 2% target. Furthermore, Mark Rutte, NATO’s secretary general and former Dutch prime minister, has employed extraordinary diplomatic tactics to flatter Trump, going as far as to refer to him as the “daddy” of the alliance, earning him the moniker of a “Trump whisperer.” Rutte has even voiced support for the Iran war, a stance that diverges from other non-US NATO members.

Despite Trump's