22 March 2025

The Once and Future Transatlantic Alliance

Michael E. O’Hanlon and Paul B. Stares

The transatlantic alliance has weathered many crises over the past 80 years, some of which seemed existential at the time. But the one now roiling the alliance feels different and much more treacherous. Unlike previous episodes of transatlantic discord, which mostly revolved around how the alliance should respond to an external threat of one kind or another, the challenge today comes from within. European leaders are asking themselves whether the United States—the alliance’s founder and steadfast champion for eight decades—is still committed to the security of Europe and the West more generally. Recent statements by U.S. President Donald Trump and his senior advisers suggest that the answer is no.

Many European leaders now believe they have no choice but to declare strategic independence from the United States and launch a crash program to defend their continent alone. But they should not. Aside from the incredible expense of achieving a credible European defense posture without U.S. military support, even voicing such an intent risks hastening a total divorce that would threaten the security of both Europe and North America. Abandoning the alliance now would amount to “committing suicide out of fear of death,” as the nineteenth-century German statesman Otto von Bismarck described preventive war.

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