President Donald Trump is heading to Turkey for a two-day NATO summit, where he will meet allied leaders to discuss Iran, Ukraine, and other pressing foreign policy matters. The gathering comes at a moment when questions about Washington's long-term commitment to the alliance remain front of mind for European governments.
The summit is being held in Ankara, putting Turkey, a NATO member with its own complex relationships across the alliance, at the center of one of the year's most closely watched diplomatic gatherings. For European leaders, the meeting is as much about reading the room as it is about resolving specific policy differences.
What Is Actually on the Table
Three issues are expected to dominate the agenda. Ukraine remains the most urgent, with allied governments watching closely for any sign that the United States is moving toward a settlement framework that bypasses Kyiv or reduces American military support. Iran is the second major flashpoint, with Washington and European capitals holding different views on how hard to press Tehran. The broader question of defense spending and burden-sharing, a recurring source of tension under Trump, will almost certainly surface as well.
NATO operates on consensus, meaning every member has to agree before the alliance takes a collective position. That gives Trump both leverage and a constraint: he can block outcomes he opposes, but so can any other ally. In practice, summits at this level produce joint communiques that reflect negotiated language, often papering over real disagreements rather than resolving them.
Why the Doubts Matter
The uncertainty about Trump's commitment to NATO is not new, but it carries more weight in 2026 than it did during his first term. European defense spending has increased across the board since Russia's full-scale invasion of Ukraine in 2022, partly in direct response to American pressure, but European governments are now also accelerating efforts to build independent defense capacity. That shift reflects a calculation that relying entirely on Washington carries strategic risk.
For markets and businesses with exposure to European defense, energy, and security sectors, the summit's tone matters more than its formal outputs. A summit that ends with visible alignment between Trump and key allies would reduce near-term uncertainty. A summit that ends in open disagreement, or that produces only vague language on Ukraine, could accelerate European defense spending plans and widen the gap between American and European policy trajectories.
Turkey's role as host adds another layer. Ankara has maintained economic and diplomatic ties with Moscow throughout the Ukraine conflict, which has put it at odds with other NATO members. Hosting the summit gives Turkish President Recep Tayyip Erdogan a prominent platform at a moment when Turkey is navigating relationships with both the West and Russia simultaneously.
The two-day format suggests the agenda is substantive rather than ceremonial. Whether the final communique reflects genuine convergence on Ukraine and Iran, or manages disagreement with diplomatic language, will be the clearest signal of where the alliance actually stands heading into the second half of 2026.
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