NATO would survive a US withdrawal. But what kind of alliance would it become?

As NATO counts down to its annual summit in Turkey in July, the alliance is facing perhaps the biggest challenge in its history – what a potential future without the United States, or US security guarantees, would look like.

In recent weeks, the Trump administration has taken a series of steps widely interpreted in European capitals as retaliation for allies’ reluctance to more strongly support the US position in the Iran war. It has announced the withdrawal of 5,000 troops out of Germany, halted the deployment of 4,000 troops to Poland and even reportedly considered moves to suspend Spain from the alliance.

Europe was already uneasy about Washington’s broader strategic intentions. Increasingly, NATO allies are realising they can no longer depend on the United States for their security and will have to shoulder far greater responsibility themselves.

US President Donald Trump’s narrow understanding of the value of alliances has long been known. Now, his vision for a new NATO is coming into view.

At a NATO defence minister meeting in February, the US under secretary of defence for policy, Elbridge Colby, introduced the idea of “NATO 3.0”. This would entail Europeans assuming a much larger role in conventional deterrence. The US, meanwhile, would prioritise strategic competition with China and supporting European security more selectively and from greater distance.

At the same time, the White House has reportedly been pushing to roll back decades of........

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