As the North Atlantic Treaty Organization (NATO) convenes its two-day summit in Ankara, Turkey, internal divisions within the alliance are coming to the forefront. The summit, beginning Tuesday, faces heightened uncertainty following public criticisms by U.S. President Donald Trump, who labeled relations between the United States and its NATO allies as “ridiculous” and “not reciprocal.” Trump has also questioned the value of the U.S. security commitments within the alliance amid ongoing disputes over defense spending.

At the previous NATO summit in The Hague in 2022, member states agreed under U.S. pressure to increase their defense budgets to 5 percent of GDP by 2035—an ambitious target not seen since the Cold War era. This includes allocating 3.5 percent for core defense capabilities and an additional 1.5 percent for security-related projects. The Ankara summit is set to assess progress on meeting these commitments, although many allies face challenges in achieving the outlined goals due to budgetary constraints and fiscal priorities.

Some NATO members have openly resisted the spending targets. Spain has opted out of the agreement, while Italy plans to reclassify civilian infrastructure expenditures, such as a large bridge project, as defense spending to meet the 5 percent target. These maneuvers underscore the difficulties in enforcing the spending plan and suggest the summit may struggle to produce meaningful advancements on this front.

The alliance has also been strained by divergent positions on geopolitical conflicts, including the U.S. expectation that NATO partners would back its military initiatives alongside Israel against Iran. This expectation has not been met uniformly, deepening rifts between Washington and European capitals. Analysts note that while the United States seeks increased financial contributions and alignment with its strategic directives, many European nations aim to maintain autonomy in their defense and foreign policy decisions. This disconnect complicates efforts to project unity during the summit.

In an effort to demonstrate NATO’s growing global engagement, Secretary General Mark Rutte has extended formal invitations to defense ministers from the alliance’s four Indo-Pacific partners—Japan, South Korea, Australia, and New Zealand—to participate in summit-related events. This move highlights NATO’s expanding interest in the Indo-Pacific region, emphasizing the alliance’s view that developments there bear directly on Euro-Atlantic security.

However, this outreach has raised concerns about potential impacts on regional stability. Critics argue that NATO’s involvement risks exacerbating tensions in the Asia-Pacific, where countries traditionally manage security issues independently. Japan’s government, led by Sanae Takaichi, has been noted for leveraging the alliance’s expanded role to support its own remilitarization efforts and elevate its strategic profile as a key U.S. partner linking transatlantic and Asia-Pacific defense architectures.

Commentators caution NATO against enabling Japan’s more assertive military stance and urge the alliance to reassess its broader approach. They argue that continuing to apply Cold War-era strategies centered on bloc rivalry and unilateralism contradicts the current demands for cooperative and comprehensive security frameworks that respect sovereignty and noninterference.

As the summit unfolds, NATO faces the challenge of balancing the United States’ push for greater burden-sharing and alignment with the preferences of its European and regional partners, all while navigating an evolving global security environment marked by complex geopolitical dynamics.