NATO faces uncertain future as Trump reshapes US role and Europe steps up

March 29, 2026

TL;DR

NATO expanded significantly after the Cold War, but began showing internal strains in the mid-2020s due to shifts in US policy.
Donald Trump's approach prioritized burden-sharing and a strategic pivot towards China, reducing direct US engagement in European defense.
European capitals adjusted to increased defense spending targets, but were unsettled by the shift in US strategic focus and transactional diplomacy.
Trump's questioning of allied sovereignty and ambiguous nuclear guarantees weakened the foundational principles of collective defense.
This has led to European discussions about extending nuclear deterrence and increased national defense ambitions, raising concerns about proliferation.
Events beyond Europe, such as US actions in Iran, further exposed a conditional nature of Atlantic solidarity.
Despite past strains, NATO has endured by reinventing itself, but the current crisis stems from internal alignment of interests rather than solely external threats.
The US views NATO as a tool for influence and managing relations, while Europe lacks viable alternatives to the alliance.
The most probable future for NATO involves continued US leadership but with reduced direct engagement, and greater operational responsibility for European members.
The alliance's internal cohesion is expected to weaken, moving from an ethos of collective defense to more conditional, interest-driven cooperation.

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