South Korea’s KF-21EX fighter is an advanced evolution of the KF-21 Boramae, designed for stealth, range, and heavy-strike power. It combines homegrown innovation with export potential, giving Seoul a sovereign option to penetrate deep defenses and maintain deterrence, even without guaranteed US backing.
This month, The War Zone reported that Korea Aerospace Industries (KAI) unveiled concept images of the KF-21EX. The upgraded design focuses on survivability against advanced air defense systems.
A key addition is twin internal weapons bays capable of carrying 900-kilogram-class Joint Direct Attack Munitions (JDAMs). These munitions can destroy hardened targets, including North Korean bunkers and command facilities. Although it will not match the F-35’s stealth, the KF-21EX incorporates a reprofiled canopy, a low radar cross-section radome, an advanced electronic warfare suite, and a modern Electro-Optical Targeting System (EOTS).
KAI is also exploring AI-enabled mission computers and expendable Digital Radio Frequency Memory (DRFM) decoys. Under the Manned-Unmanned Teaming (MUM-T) Combat System, the aircraft is intended to work alongside stealth “loyal wingman” drones. A possible two-seat variant could coordinate drone missions and provide escort jamming.
Internal weapon storage solves payload limits faced by drones. This ensures the manned fighter retains a heavy-strike capability while minimizing its radar signature. With 120 KF-21s expected in ROK Air Force service by 2032, it remains unclear if the EX will replace or complement part of the fleet.
By taking a modular approach, KAI positions the KF-21EX as a flexible platform for both domestic defense and international sales.
READ: South Korea Presidential Election: Driving Regional Stability
