The ‘post-global’ NATO: Spain’s airspace ban signals the death of universal alliances

The Atlantic alliance is currently facing a challenge that cannot be resolved by increased defense spending or high-level summits. The Spanish government officially closed its airspace to U.S. military aircraft involved in the conflict with Iran.

This decision follows Madrid’s earlier refusal to allow Washington to use jointly operated bases at Rota and Morón de la Frontera for offensive strikes. Although many in Washington view this as a temporary diplomatic rift or a leftist protest by Pedro Sánchez, such a reading misses a more profound structural shift. We are witnessing the end of the blank-check era for American military expeditions and the birth of a post-global NATO.

For decades, the operating assumption in Washington has been that a special relationship or a formal alliance guaranteed a baseline of logistical and moral support for U.S. security priorities. Whether in the Cold War or the early years of the War on Terror, the map of Europe was essentially an open corridor for the projection of American power.

But Spain’s move to block flight paths for aircraft participating in Operation Epic Fury, including those stationed as far away as the United Kingdom, signals that the era of automaticity is over. Madrid is not just expressing a preference; it is asserting a sovereign-interests-first model that fundamentally alters the geography of modern warfare.

The immediate consequences are logistical. U.S. warplanes must now reroute around the Iberian Peninsula, increasing fuel consumption and flight times for missions in the Middle East. However, the political consequences are far more significant. Spain has........

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