Türkiye's Quest for a Fifth-Generation Fighter Jet: The F-35 Crisis and the KAAN Project

Türkiye’s 21st-century air power strategy has undergone a fundamental transformation, shifting from its participation in the multinational F-35 Lightning II program aimed at modernizing its F-16 fleet, to a strategic pivot following the diplomatic crisis triggered by the acquisition of the Russian S-400 air defense system. This process has reinforced the country’s goal of reducing dependence on foreign defense suppliers and elevated the KAAN project—a national initiative to meet fifth-generation fighter aircraft requirements through indigenous capabilities—to a strategic priority. Initially planned as a collaborative international effort, this critical technological capability has since become a symbol of Turkish independence and technological advancement.

F-35 Program and the S-400 Crisis

In the early 2000s, Türkiye joined the F-35 Joint Strike Fighter (JSF) program with the objective of establishing it as the future backbone of the Turkish Air Force. However, the decision to procure the Russian S-400 Triumf air defense system in line with national air defense needs triggered a crisis that altered the course of the program and strained relations with the United States.

Exclusion Process and Justifications

U.S. officials argued that Russian-made S-400 radar systems posed a risk of detecting and transmitting sensitive data on the stealth characteristics and avionics of advanced platforms like the F-35 to Russia, thereby constituting a threat to NATO security. Türkiye countered that these claims lacked technical grounding and were politically motivated. Defense Industry President İsmail Demir stated that American officials failed to provide a technical explanation for the alleged risks of co-deploying the S-400 and F-35 systems.

Following the delivery of the first components of the S-400 system to Türkiye in June 2019, the United States suspended Türkiye’s participation in the program in July 2019 and formally notified Ankara in April 2021 of its official removal from the F-35 program.

Consequences of the Crisis

As a result of this decision, F-35 aircraft owned by Türkiye but stationed in the United States for pilot training were not delivered, and production of over 1,000 components manufactured by Turkish defense industry companies was halted. This development compelled Türkiye to focus exclusively on its own national project to fulfill its fifth-generation fighter aircraft requirement.

National Fighter Aircraft: KAAN

Developed to fill the void created by the F-35 exclusion and to ensure strategic autonomy, the National Fighter Aircraft project is among the most significant initiatives in Türkiye’s aviation history. Led by Turkish Aerospace Industries (TUSAŞ), the project is known as “KAAN.”

Development Process and Milestones

The KAAN project aims to demonstrate Türkiye’s capacity to design, develop, produce, and certify its own combat aircraft. Key milestones include:

• Roll-out: 18 March 2023.

• First Flight: 21 February 2024. With this historic flight, KAAN took to the skies.

• Future Plans: The second prototype is scheduled to conduct its first flight within 2025, followed by accelerated testing and development activities in subsequent years.

The goal is for KAAN to gradually replace Türkiye’s F-16 fleet in the inventory of the Turkish Air Force starting in the 2030s.

Technical Features and Strategic Capabilities

Developed by TUSAŞ, KAAN incorporates the most advanced technologies characteristic of a fifth-generation fighter aircraft. According to official sources, its core capabilities include:

• Air Superiority: Enhanced beyond-visual-range air-to-air combat capability supported by next-generation weapons.

• Low Observability and Internal Weapons Bays: A stealth-optimized airframe design that makes radar detection difficult, with weapons carried internally to minimize radar signature.

• Supersonic Strategic Strike: Ability to cruise at high supersonic speeds without using afterburners (supercruise) , combined with precision strike capability from internal weapons bays.

• Enhanced Combat Power: Support for pilot decision-making through artificial intelligence and neural networks, and integrated situational awareness via sensor fusion.

Future Prospects and Strategic Implications

The successful completion of the KAAN project holds the potential for Türkiye to achieve a generational leap in military and technological terms. The strategic outcomes of developing these technologies at this stage include:

• Strategic Autonomy: Türkiye will no longer be dependent on foreign suppliers for one of its most critical defense systems and will possess a platform tailored to its own operational needs.

• Technological Competence: The knowledge gained in composite materials, advanced avionics, artificial intelligence, sensor technologies, and low observability will be transferred to other civil and military projects, triggering a broader technological leap.

• Regional Power Balance: A Türkiye capable of independently developing and deploying a fifth-generation fighter aircraft will have the potential to shift military and geopolitical power dynamics in its favor within the region.

• Economic Contribution and Export Potential: The project will create a high-tech ecosystem providing employment for thousands of engineers and technicians, and in the future, it may generate significant revenue through exports to friendly and allied nations.