South Korea Unveils KF-21 Boramae Block 2 with Enhanced Stealth Features

Korea Aerospace Industries has unveiled the Block 2 variant of the KF-21 Boramae fighter, featuring significant improvements to the aircraft’s low-observable characteristics and weapons integration capabilities. The upgraded design addresses earlier criticisms about the fighter’s semi-stealth configuration.

The most visible change is the addition of internal weapons bays, transitioning the KF-21 from a 4.5-generation to a true fifth-generation fighter configuration. Block 2 aircraft can carry four air-to-air missiles internally while maintaining a significantly reduced radar cross-section.

“Block 2 represents our vision for the KF-21 fully realized,” said Dr. Park Sung-ho, Korea Aerospace Industries Chief Technology Officer. “We have delivered a fighter that can compete with the best in the world at a fraction of the cost.”

The upgraded variant also features an improved AESA radar with a 40 percent increase in detection range and enhanced electronic warfare capabilities developed domestically by Korean defense contractors. The cockpit has been redesigned with a panoramic display system similar to those found in the F-35.

South Korea’s Air Force has ordered 120 KF-21s, with the first Block 2 aircraft expected to enter production in 2028. The initial 40 Block 1 aircraft will be upgraded to Block 2 standard during scheduled depot maintenance cycles.

Export interest has been strong, with Indonesia, Malaysia, and several Middle Eastern nations reportedly in discussions for potential purchases. Indonesia remains a development partner and is expected to receive technology transfer for domestic production.

The KF-21 program has been heralded as a success for Korean aerospace independence, demonstrating the nation’s ability to design and produce advanced combat aircraft domestically. Total development costs have remained under $8 billion, making it one of the most cost-effective fighter programs in recent history.

Flight testing of the first Block 2 prototype is scheduled to begin in early 2027.