President Donald Trump accused NATO members of abandoning the United States during the war against Iran at a summit in Ankara [1].
The tension threatens the stability of the North Atlantic Treaty Organization if the U.S. decides to withdraw from the alliance. This shift would fundamentally alter the security architecture of Europe and the Middle East.
Trump expressed anger toward the alliance during meetings on April 8, 2026 [1]. He said that NATO members had "turned their backs on the United States" [1], [2]. The president argued that European allies failed to provide sufficient support in the conflict with Iran, prompting his calls for a dramatic increase in European defense spending [1].
Prior to the summit in Turkey, Trump met with NATO Secretary-General Mark Rutte in Washington, D.C. [1], [2]. During these discussions, the president raised the possibility of a U.S. withdrawal from the organization [3].
Disputes regarding the use of strategic assets have further strained relations. Mark Rutte said that 500 U.S. aircraft took off from bases in Italy [4]. This claim comes despite denials from Rome regarding the use of Italian bases for operations against Iran [4].
The president continues to press for a redistribution of the financial burden of collective defense. He said that the current arrangement is unsustainable for the U.S. while other members do not contribute their fair share [1].
“"turned their backs on the United States"”
The threat of U.S. withdrawal from NATO reflects a pivot toward transactional diplomacy in national security. By linking alliance membership to specific support in the Iran conflict and higher spending quotas, the U.S. is challenging the traditional mutual defense framework. If the U.S. exits or reduces its role, European nations would be forced to rapidly militarize independently, potentially creating a fragmented security landscape in the Atlantic.
