geopolitics power

Alliance Without a War

What happened

During the US-Iran war that began in late February 2026, several NATO members declined to provide active military support. Spain closed its airspace to US bombers, Italy refused basing rights, and Germany publicly criticized the operation. Trump responded with a series of escalating threats: he demanded European defense spending increases, accused allies of 'neutrality' in America's conflict, and suggested withdrawal from NATO after a tense White House meeting with Secretary General Mark Rutte. By early April, the ceasefire had created a temporary pause in hostilities, but Trump's anger at NATO allies remained public and pointed. Rutte responded by publicly praising Trump and calling the world 'safer.' Starmer backed the alliance while acknowledging European members must strengthen their commitments.

NATO's mutual defense commitment was tested by a US-initiated war where no NATO territory was attacked, and it failed in the only honest sense: several members treated Article 5 as a guarantee they receive, not one they owe. Trump is right that the alliance is asymmetric. He is wrong that threatening it fixes the asymmetry.

The Hidden Bet

Trump can punish NATO allies by threatening withdrawal

Congressional approval is required for formal US withdrawal from NATO. Trump's actual leverage is softer: reducing intelligence sharing, withdrawing troops from Germany, or selectively applying Article 5 commitments. These are real threats, but they hurt US security interests too. The damage is mutual.

European NATO members refusing to join the Iran war weakens the alliance

The Iran war was a US-initiated offensive operation, not collective defense of NATO territory. Article 5 covers attacks on members, not expeditionary wars of choice. European members had a legally and morally coherent basis for non-participation. The precedent they are actually setting is that NATO is a defensive alliance, not a force multiplier for US foreign policy. That is arguably NATO's original purpose.

Rutte's public praise of Trump stabilizes the relationship

Every time a NATO leader publicly endorses Trump's Iran war framing, it alienates European publics and weakens the domestic political base for defense spending increases. Rutte is buying short-term alliance stability by spending long-term legitimacy.

The Real Disagreement

The actual fork: NATO is either a collective defense alliance where members can choose not to join offensive wars, or it is a burden-sharing arrangement where the US expects military participation in return for its security guarantee. These two definitions of the alliance have been in tension since 1949, and the Iran war has forced the choice. The first definition protects European political autonomy but risks US disengagement. The second definition keeps US troops in Europe but requires European governments to follow the US into wars their publics oppose. The US framing says: pay more or lose us. The European framing says: we did not sign up for Iran. Both are true. The question is who blinks first, and the answer historically has been Europe because the alternative is worse.

What No One Is Saying

Rutte calling the world 'safer' after the Iran war is not diplomacy. It is a statement that the NATO Secretary General will publicly endorse any US military action to keep Washington in the alliance. That makes NATO's legitimacy entirely contingent on US restraint, which is exactly the leverage Trump is exploiting.

Who Pays

European defense establishments

Medium-term, budget cycles 2027-2030

Trump's threat has accelerated calls for European spending increases. Countries that were already stretching budgets to hit 2% GDP targets are now facing demands for 3% or more, which means cuts to social spending or debt increases.

Germany

Immediate diplomatic cost; medium-term defense investment pressure

Germany publicly criticized the Iran operation and now faces the most pointed US pressure. Trade, troop stationing, and intelligence relationships are all on the table. Germany is simultaneously trying to rearm and maintain US support while opposing US foreign policy.

Ukraine

Ongoing; compounded if US reduces NATO commitments

A weakened or distracted NATO is reduced capacity to support Ukraine's ongoing defensive effort against Russia. Trump's attention is on Iran and NATO compliance, not Kyiv. The Easter truce between Russia and Ukraine (announced the same weekend) coincided with complete US diplomatic bandwidth being consumed by Iran talks.

Scenarios

Managed degradation

NATO survives formally but becomes functionally bifurcated: the US maintains Article 5 commitments for Eastern Europe (facing Russia) but treats Western European members as free-riders on defense spending and non-participants in US expeditionary operations. The alliance exists on paper; the trust is gone.

Signal The US withdraws a brigade from Germany within 6 months of the Iran ceasefire

European strategic autonomy accelerates

France, Germany, and the UK accelerate joint defense spending and command structures that do not depend on US participation. NATO becomes an umbrella over two parallel defense architectures. The US eventually finds this useful because it reduces burden-sharing demands.

Signal EU announces a joint rapid reaction force with independent command authority and a budget exceeding 50 billion euros

Alliance renews under pressure

European members agree to a new defense spending commitment (3% GDP) and a revised Article 5 understanding that extends to US expeditionary operations in agreed circumstances. Trump calls it a win; Europe calls it a modernized alliance. The underlying tension is not resolved.

Signal A formal NATO summit communique includes language on 'shared expeditionary obligations' with European signatures

What Would Change This

If Russia moves militarily against a NATO member in the next 12 months, the Iran dispute becomes irrelevant and the alliance snaps back together around collective defense. That is the scenario that makes Trump's threat empty and Europe's non-participation in Iran irrelevant. Every other scenario continues the current deterioration.