NATO's structure relies on allies following an American general's command under Article 5. After witnessing the "horrible, catastrophic failure" of US strategy in Iran, European nations will no longer entrust their militaries to US leadership, making the alliance functionally obsolete.

Major European allies like the UK and France face a "lethal problem" where raising defense spending to meet US-led targets could trigger a bond market revolt. This fiscal constraint, coupled with voter opposition to tax hikes, makes meeting these commitments politically and economically untenable.

Europe is treating its relationship with the U.S. as an irreversible investment decision under uncertainty. Leaders must choose between waiting for a return to the old transatlantic alliance or committing massive capital to build independent security and economic systems.

The current strain in the transatlantic relationship has evolved beyond policy disputes, like the 2003 Iraq War, into a political crisis. Actions regarding Ukraine and Greenland are perceived as a "U.S. betrayal," shattering the foundational trust that once held the alliance together and making recovery far more difficult.

The transatlantic relationship is undergoing a fundamental "divorce." The future isn't about restoring the old alliance but creating a new, more detached partnership. Like friendly ex-spouses, the U.S. and Europe may coordinate on global issues, but only after Europe first defines and acts on its own independent interests.

By forgoing a coalition, unlike past presidents, Trump's administration forces the U.S. to bear the entire financial and diplomatic cost of the Iran conflict. Allies, feeling unconsulted, are refusing to help, leaving America isolated to 'own' the problem it created.

The administration's aggressive, unilateral actions are pushing European nations toward strategic autonomy rather than cooperation. This alienates key partners and fundamentally undermines the 'Allied Scale' strategy of building a collective economic bloc to counter adversaries like China.

Regardless of the Iran war's duration, the conflict ensures Europe will face structurally higher energy costs, damaging its industrial competitiveness. This is causing macro investors to sour on European equities and credit, even if the foreign exchange market has not yet fully reflected this risk.

European nations funded generous social programs by relying on American military protection for decades. With the US becoming an unreliable ally, they face a political breaking point: dismantle their popular social contract to fund their own defense, or submit to Russian pressure.