By Lucien Morell

JAKARTA, Indonesia: The claimed successful targeting of a US F-35A Lightning II fighter by Iranian air defenses marks a potential watershed moment in modern aerial warfare, challenging the long-held doctrine of stealth invincibility and signaling a costly shift in military strategy for the Pentagon and its allies.

According to reports from Iranian state-affiliated media and analysis of footage released by the Islamic Revolutionary Guard Corps (IRGC), a US F-35A was struck by a surface-to-air missile over central Iran on March 19 . The aircraft, which reportedly sustained damage and made an emergency landing at a US base in the region, was tracked not by traditional radar, but by an electro-optical system that guided the missile to its target .

This engagement represents the first time a fifth-generation fighter has been hit by enemy fire in combat, piercing the aura of near-invulnerability that has surrounded aircraft like the F-35 . If confirmed, the incident provides a compelling case study for how established air power paradigms are being challenged by asymmetric technology.

The 'Invisible Radar' and the Blind Spot of Stealth

The F-35's primary advantage is its low-observability, or stealth, designed to evade or significantly delay detection by high-frequency fire-control radars. However, the Iranian system bypassed this advantage entirely. By employing a passive electro-optical tracking system, Iranian forces effectively used an "invisible radar" that emits no signals and therefore cannot be alerted by a fighter's radar warning receivers .

The system likely relied on detecting the aircraft's infrared signature—the heat from its engine and the friction of its airframe against the air . The released footage reportedly showed the F-35 flying a steady course, deploying neither countermeasures nor evasive maneuvers, suggesting its pilot was completely unaware of the imminent threat .

This tactic is not entirely new. In 2018, Houthi forces, using Iranian-supplied technology, claimed to have successfully targeted a Saudi F-15 using a similar infrared-guided missile . The difference now is the target: the US Air Force's most advanced, networked, and expensive tactical aircraft, an asset also operated by numerous allies including Japan, South Korea, and NATO members.

Implications for the F-35 and US Air Power

While the F-35 is not rendered obsolete overnight, its operational envelope has been significantly complicated. The aircraft is designed as a first-line penetrator, intended to suppress enemy air defenses (SEAD). The Iran engagement suggests that against a determined adversary with even modest technological capabilities, the F-35 can no longer operate with impunity deep in contested airspace without dedicated support.

The vulnerability lies in the physics of flight. As experts note, a stealth aircraft can minimize its radar cross-section, but it cannot eliminate its "heat footprint" . Advanced Infrared Search and Track (IRST) systems, such as those already fitted to Chinese J-10C, J-16, and Russian Su-35 fighters, can passively detect and track these heat sources . This allows non-stealth "fourth-generation" fighters to engage stealth targets, leveling the playing field in visual-range combat.

For the US, this reinforces an already observable trend: a pivot toward "stand-off" warfare. The Pentagon is actively expanding production of the Stand-in Attack Weapon (SiAW), a high-speed missile designed specifically for the F-35 to destroy mobile air defenses, missile launchers, and jammers from within contested airspace . The SiAW, along with the AGM-88G AARGM-ER, is designed to counter the very "shoot and scoot" tactics that make mobile systems like the one used by Iran so dangerous .

This approach, however, comes at a cost. Firing stand-off weapons from safer distances reduces the time over target and increases munition expenditure. It also demands a deeper magazine, forcing the US to ramp up production and invest further in its industrial base . The alternative—sending F-35s into close-range engagements with an enemy that can passively track them—is now a far riskier proposition. This may also factor into broader defense budgeting; reports indicate the US is planning to cut its F-35 orders for 2026 as part of a strategic shift in spending priorities .

The Russian and Chinese Dimension

For US adversaries and competitors like Russia and China, the Iranian success serves as a powerful validation of their own long-standing investment in counter-stealth technologies.

Russia's S-400 Triumf and the newer S-500 Prometheus systems are explicitly designed to engage stealth aircraft . The S-500, in particular, boasts a 600-kilometer range and advanced radars claimed to be capable of detecting and engaging fifth-generation fighters and hypersonic missiles . The Iranian engagement demonstrates the tactical viability of the underlying principle: using multi-spectrum sensors to find the gaps in a stealth aircraft's defenses.

China has also aggressively pursued counter-stealth capabilities. Systems like the JY-27A and JY-27V Very High Frequency (VHF) band radars are designed specifically to detect stealth aircraft, which are less optimized against longer wavelengths . When networked with fire-control systems and advanced surface-to-air missiles like the HQ-9B, these radars form a critical component of China's Anti-Access/Area Denial (A2/AD) strategy . Unconfirmed reports have even suggested the possible deployment of Chinese-made HQ-9B systems to Iran, which are said to possess a capability to track the F-35 .

Furthermore, Chinese and Russian fourth-generation fighters are increasingly equipped with advanced IRST systems. A J-16 or Su-35, networked with ground-based VHF radar, could be passively guided toward the vicinity of an F-35 before using its own IRST to achieve a lock—all without emitting a single radar ping. This "silent kill" chain is precisely the threat that the Iranian engagement has now validated.

Conclusion: A New Era of 'Multi-Spectrum' Warfare

The F-35 remains a formidable intelligence-gathering and strike platform. However, the Iran incident signals the end of the era where stealth alone guaranteed survival. The future of air combat will be defined by multi-spectrum warfare, where dominance requires not just one "invisible" attribute, but a networked system of sensors across radar, infrared, and electronic bands.

For the US and its allies, this means investing in electronic warfare, decoys, and stand-off munitions to protect their prized fifth-gen fleet. For potential adversaries, it confirms that their substantial investments in counter-stealth are on the right track. The battle for air superiority has entered a new, more complex, and more expensive phase.

*Lucien Morell is a Southeast Asia based geopolitical observer and analyst.*