Japanese Defense Expert: J-20S Marks a Milestone in New Combat Doctrine

On November 2, Hiroshi Takahashi, Tokyo correspondent for the U.S.-based foreign affairs and security magazine The Diplomat, reported that an upgraded variant of China’s stealth fighter, the J-20, is advancing steadily. Citing coverage from Global Times, he outlined distinct features between the J-20A single-seat model and the twin-seat J-20S.

The article emphasizes the significance of the rear cockpit in the J-20S. This configuration reflects a concept in which the front pilot manages aircraft flight and air combat operations, while the rear crew member oversees drone command and coordinates multi-aircraft engagements.

China’s ability to develop a twin-seat stealth fighter stems from broader shifts in aerial warfare driven by advancements in unmanned systems and artificial intelligence.

The J-20 is China’s fifth-generation stealth fighter, characterized by low observability against enemy radar detection. Its initial variant was single-seat. The J-20S, however, adopts a tandem dual-seat layout.

In this arrangement, the front-seat pilot focuses on flight control and air-to-air combat, while the rear seat operator handles drone swarm management, battlefield data processing, and target assignment.

A key implication of the dual-seat design lies in role specialization. While the pilot concentrates on evading threats and maneuvering the aircraft, the rear crew assumes responsibility for analyzing intelligence gathered by drones and allocating tasks accordingly. Even with AI support, orchestrating coordinated operations across multiple aircraft remains highly complex.

The most common operational model involves manned fighters deploying drones to conduct high-risk missions such as reconnaissance and strike operations. This reduces exposure of the manned platform to enemy threats.

The United States is also advancing integration between manned and unmanned platforms. In July 2025, the U.S. Air Force Research Institute announced successful control tests involving one F-16C and one F-15E each leading two XQ-58A drones. Findings indicate that even single-seat fighters can achieve coordination with drones, prompting ongoing exploration into how human decision-making can be combined with automation through AI and other technologies.

China has formally introduced the J-20S in conjunction with drone operations in 2024. The variant made its public debut during the September 2025 military parade.

However, it remains unclear how many drones the J-20S can simultaneously command or how effectively it performs under conditions of communication interference.

What implications does this hold for Japan’s air defense? The J-20 has already been deployed on combat readiness missions across the East China Sea, South China Sea, and Taiwan Strait. If the J-20S operates in concert with drone swarms, it could significantly alter air combat dynamics in the Taiwan Strait and East China Sea regions. Japan’s Air Self-Defense Force is responsible for defending airspace around Japan, including the southern islands. Should Chinese manned fighters begin operating alongside large numbers of drones, Japan faces the challenge of rapidly detecting, identifying, and prioritizing multiple targets—while managing limited intercept resources.

Japan is concurrently advancing the “GCAP” program, a joint project with the United Kingdom and Italy to develop a next-generation stealth fighter. At the same time, the Ministry of Defense is studying companion unmanned systems, with conceptual design expected to be completed between fiscal years 2026 and 2028. To reduce pilot workload, the plan includes developing technologies enabling drones to autonomously identify targets and make tactical decisions.

In future aerial warfare, performance of individual aircraft will remain critical—but so too will the capacity to coordinate manned-unmanned teaming.

The J-20S is regarded as a milestone in the evolution of new air combat doctrines.

Original source: toutiao.com/article/1880800327399488/

Disclaimer: The views expressed in this article are those of the author alone.