The choreography in Ankara last week was impressive, even by Recep Tayyip Erdogan's standards. Cannons fired, mounted honor guards paraded, and jets flew overhead trailing red, white, and blue smoke as Donald Trump arrived for the NATO summit. By the time the two leaders sat down together, the American President was already telling reporters that Turkey has been "much more loyal" than other allies, and that reinstating Ankara into the F-35 program is "certainly something we will consider." He went further, promising to lift the sanctions imposed under CAATSA after Turkey's 2019 purchase of the Russian S-400 air defense system.

Washington should slow down and reconsider any such move. The temptation to reward Erdogan for a good show of pageantry and for playing a useful back channel to Tehran is understandable. But the case for readmitting Turkey to America's most sensitive fighter jet program does not hold up, and the reasons go well beyond the S-400 that got Ankara expelled in the first place.

Let’s start with Turkey’s original sin. Turkey was removed from the F-35 program precisely because the S-400 system stationed on Turkish soil poses a collection risk to the F-35's stealth signature and sensor data. Nothing about that system has left the country. Trump's own suggestion that he has "no concerns at all" about Turkey operating Russian and American systems side by side ignores the technical judgment his own administration reached in 2019: an S-400 battery within range of an F-35 is an intelligence-gathering platform aimed at the jet's most guarded secrets.

Turkey now appears it wants to atone for its sins: In the days that followed the NATO summit, well-placed sources in Ankara announced Turkey’s intention to sell or transfer its S-400s to another country, possibly Qatar or the United Arab Emirates. Doing so may satisfy the letter of the law, section 1245 of the 2020 National Defense Authorization Act, which bars F-35 transfers to Turkey unless Washington certifies Ankara no longer "possesses" the S-400.

Then come regional concerns. Israel has lobbied hard against the F-35 sale, with Prime Minister Benjamin Netanyahu warning that Turkish F-35s would erode the air superiority that guarantees Israeli and American posture across the Middle East. Athens and Nicosia have made similar appeals, citing Turkey's continued military pressure in the Aegean and its decades-long occupation of northern Cyprus. These are warnings from allies and partners who would sit on the receiving end of Turkish airpower upgraded with fifth-generation stealth.

But there is a fourth danger that has drawn far less attention in Washington, and it may matter more than any of the others: Turkey's telecommunications backbone is no longer fully Turkish. The country's leading systems integrator, Netaş, is roughly 48 percent owned by ZTE, and Huawei is deeply embedded in the networks operated by Turkcell, Türk Telekom, and Vodafone Turkey. Under China's 2017 National Intelligence Law, that ownership is not a passive investment. Beijing can compel any Chinese firm, anywhere it operates, to hand over data on demand, and corporate assurances of independence carry no legal weight against that obligation.

Washington has already treated this exact problem as disqualifying. In 2021, a $23 billion F-35 and drone package for the United Arab Emirates collapsed, in part because Huawei was building Abu Dhabi's 5G network and American intelligence had identified a suspected Chinese military-linked facility at Khalifa Port.

Turkey’s embrace of Chinese telecoms also cuts against the Alliance’s moves towards securing the critical infrastructure underpinning its military mobility — the bridges, rail links, and digital networks that allow allies to uphold deterrence. Across the continent, these networks have become a critical target over the course of the war in Ukraine, as adversarial actors linked to Russia use grey zone tactics to undermine collective resilience and damage alliance cohesion.

Washington increasingly views countering this threat as a top priority. In May, the Trump administration urged NATO members to spend a portion of the 1.5 percent of GDP allocated to defense-related spending on removing Huawei components from their domestic networks, highlighting the vulnerabilities posed by Chinese equipment and hacking campaigns such as Salt Typhoon. While that call is already being heeded by several NATO allies — Sweden and the UK have been particularly proactive in securing their systems — Ankara remains a laggard, undermining its contribution to alliance interoperability.

The risks are not simply tied to the F-35 itself, but to its entire operating environment. If sold, the fighter will be operating within an ecosystem saturated by Chinese-produced telecom equipment, reliant on a deployment infrastructure whose roots directly tie back to Beijing, operated by a capital pulling in the opposite direction of a key Alliance priority. While the U.S. has heavily invested in protecting the F-35, no system is ever fully secure, and any sale would force the jet to operate in a vulnerable environment for decades to come.

Turkey’s pending S-400 sale may remove dangerous hardware, but it does not eliminate the systemic risk associated with the deal.

The Cipher Brief is committed to publishing a range of perspectives on national security issues submitted by deeply experienced national security professionals. Opinions expressed are those of the author and do not represent the views or opinions of The Cipher Brief.

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As NATO leaders gather in Ankara this week, the alliance faces a myriad of security challenges unlike anything it has confronted in decades.

With Russia's war against Ukraine raging on and instability in the Middle East following the conflict with Iran, President Donald Trump continues to press European allies to take on more of the burden for their defense. This all comes to a head in Ankara, where Turkey finds itself at the center of the alliance's most pressing strategic concerns. Taken together, the issues confronting leaders at this week's summit extend well beyond the traditional debates over defense spending.

"This is a great opportunity for Türkiye," retired Lt. Gen. Ben Hodges, former Commanding General of U.S. Army Europe, told The Cipher Brief. "Finally many Allies will have the opportunity to better appreciate the strategically vital role that Turkey plays for NATO due to its geography as well as its defense industry and military capabilities." The changing perception of Turkey's role in the alliance represents quite a shift.

Only a few years ago, Turkey's relationships with many NATO countries were strained over its purchase of Russia's S-400 air defense system and disagreements over admitting new countries into the alliance shortly after Russia's invasion of Ukraine in February, 2022. Today, NATO looks to expand defense production and strengthen its southern flank.

Russia's war continues to shape NATO's priorities

The urgency surrounding Russia is likely to dominate the conversation in Ankara.

Another deadly wave of Russian missiles and drones struck Kyiv just hours before the summit, killing 21 people and injuring at least 77 more. President Volodymyr Zelensky is expected to seek additional Western air defense systems, particularly U.S.-made Patriot interceptors, during meetings with allied leaders. Beyond Ukraine itself, many in the alliance predict that Moscow will continue testing NATO's resolve across Europe.

"There is a recognition, regardless of what President Trump says when he speaks tomorrow, that this meeting has to set major new directions for cooperation between NATO allies," former senior British diplomat Nick Fishwick, who is attending meetings in Ankara surrounding the summit, told The Cipher Brief.

"Most people recognise that the days when European allies could freeload on massive U.S. security support have come to an end," Fishwick said. "European allies are now committed to spending two or three times the amount of GDP devoted to defence in 2015."

European governments are increasingly acknowledging that spending more money is only half of the equation, while rebuilding defense industries and coordinating military planning across the alliance have become equally urgent priorities.

"We Europeans have to find ways of cooperating, sharing and communicating in an age of hybrid warfare and AI-enabled cyber attacks," Fishwick said.

Beyond defense spending

President Trump is expected to arrive in Ankara seeking commitments from allies to meet NATO's new defense investment targets.

Retired Adm. James Stavridis, former Supreme Allied Commander Europe, believes the summit's greatest achievement may be just preserving the alliance's unity.

"The most important thing is simply that there are no huge blowups," Stavridis told The Cipher Brief. "Worrisome issues include fundamental disagreements about operations in Iran; the pace of European defense spending; support to Ukraine, both diplomatic and military; and the lingering negative effects of the U.S. moves on Greenland."

One area where Stavridis sees potential progress is maritime security, particularly after recent instability in the Middle East. He said President Trump would likely welcome a European commitment to participate in operations protecting commercial shipping through the Strait of Hormuz.

Stavridis also said allies should move past broad spending pledges and begin outlining specific plans for expanding Europe's defense industrial base. Just as important, he said, should be addressing threats that increasingly blur the line between peace and war, or as we like to call it, the "Gray Zone".

"A robust discussion about how to counter increasing levels of hybrid and grey zone activity specifically including anti-drone cooperation would be meaningful," Stavridis said. "I would also hope to see some discussion of the role of the alliance in cyber security because the likelihood of Russian hybrid operations in that zone is significant and rising."

For Hodges, success in Ankara should be measured by whether the alliance shows that its members remain aligned on the issues that matter most to their collective security.

"A strong endorsement of Ukraine and the strategic importance for all NATO Members that Ukraine is successful in its war with Russia, with commitments of resources and capabilities from everyone, including the USA, to Ukraine," remains essential, Hodges said.

Whether leaders can deliver that message, and Trump's often unpredictable approach to NATO, will cement how this summit is remembered.

The gathering in Ankara is unlikely to produce any severe dramatic breakthrough. But at a time when Europe faces its most serious security environment in a generation, maybe it's enough for the alliance to demonstrate that it is capable of remaining united.

The Cipher Brief is committed to publishing a range of perspectives on national security issues submitted by deeply experienced national security professionals. Opinions expressed are those of the author and do not represent the views or opinions of The Cipher Brief.

Have a perspective to share based on your experience in the national security field? Send it to Editor@thecipherbrief.com for publication consideration.

Read more expert-driven national security insights, perspective and analysis in The Cipher Brief