For six years, Turkey has been the awkward NATO ally standing in the corridor, barred from the club it helped build. Ankara was a founding industrial partner in the F-35 Joint Strike Fighter programme, manufacturing fuselage components and other hardware before the United States ejected it in 2019 following its purchase of Russia's S-400 surface-to-air missile system. Under U.S. law — specifically the Countering America's Adversaries Through Sanctions Act (CAATSA) — buying significant Russian defence equipment triggers automatic penalties, and the Pentagon concluded it could not allow Turkey's Air Force to operate stealth jets while Russian hardware sat on Turkish soil capable of mapping their radar signatures. That logic has not changed on paper. What has changed is who sits in the Oval Office.

Seated beside Turkish President Recep Tayyip Erdoğan at a NATO summit in Ankara this week, Donald Trump said the United States would consider selling F-35s to Turkey. He did not hedge it as a distant aspiration or a diplomatic courtesy. He said it plainly, in public, with Erdoğan next to him. That is a geopolitical signal, not a press release — and every defence ministry in the Middle East read it as one.

Israeli Prime Minister Benjamin Netanyahu moved fast. In direct communications with the Trump administration, Netanyahu argued that transferring fifth-generation stealth fighters to Turkey would, in his words, "destroy the balance of power" in the Middle East. The objection is not abstract. Turkey and Israel have no formal alliance, their relationship has been openly hostile since the Gaza war deepened, and Ankara under Erdoğan has positioned itself as a champion of Palestinian statehood. Giving Erdoğan an air force capable of projecting stealth power across the eastern Mediterranean is, from Jerusalem's perspective, an existential calculus problem, not a diplomatic nicety.

Trump's response to Netanyahu's appeal was, by any measure, a rebuff. Rather than softening his stance or offering ambiguity, Trump went further — volunteering publicly that Erdoğan "could have" joined Iran in military action against Israel, and that he had not done so because of Trump's personal relationship with him. The framing was characteristic Trump: personal credit claimed, threat implied, and a clear message to Netanyahu that Turkey's cooperation has a price tag and Trump intends to pay it with hardware.

What makes this more than a bilateral spat is the S-400 question, which has never been resolved. Turkey has not dismantled the Russian system. It has not placed it in storage in any way that satisfies U.S. technical requirements for protecting F-35 low-observable characteristics. The CAATSA statute is still on the books. Any actual sale would require either a presidential waiver, a congressional carve-out, or Turkey making verifiable concessions on the S-400 — none of which have been announced. The gap between Trump's public posture and the legal architecture required to execute a sale remains significant. Watchers of the defence procurement world know that Trump signals are not contracts; they are openings, and openings can close.

But the opening itself matters. Defence analysts have long noted that Turkey's exclusion from the F-35 programme accelerated Ankara's interest in alternative platforms, including a domestic fighter project — TF Kaan — and preliminary inquiries about Russian Su-35s and Su-57s. If Washington is serious about pulling Turkey back into the Western aerospace ecosystem and away from further Russian dependency, the F-35 is the obvious lever. The counterargument — Israel's counterargument — is that the same lever, once pulled, cannot be un-pulled, and that an Erdoğan-era Turkey with stealth air power is a fundamentally different strategic environment for everyone in the region.

Netanyahu has worked hard in public to characterise his relationship with Trump as unshaken, describing it as "rock solid" and emphasising shared positions on Iran's nuclear programme. The F-35 dispute complicates that narrative substantially. It suggests that Trump's Middle East calculus in his second term is more transactional and less deferential to Israeli red lines than the prior term's record might imply — and that Erdoğan, who has cultivated his Trump relationship with considerable skill, is cashing in accumulated goodwill at a moment when the price of stealth jets is denominated in strategic access and NATO cohesion.

For Turkey, the stakes are straightforward: rejoining the F-35 programme would restore industrial revenue, modernise its air force, and signal full rehabilitation within the NATO defence architecture. For the broader alliance, the question is whether Washington is prepared to create a pathway that rewards S-400 procurement with eventual F-35 access — and what that precedent communicates to every other NATO member currently weighing Russian defence offers. That question has no comfortable answer, and right now, nobody in power is being asked to answer it directly.