India Rejects Russia’s Su-57E Radar: New Delhi Demands DRDO Uttam AESA Upgrade or No Deal

(DEFENCE SECURITY ASIA) – India’s insistence that Russia must replace key components of the Su-57E stealth fighter—including its radar—with Indian-made systems as a precondition for purchase has reportedly triggered growing concern and dissatisfaction among Moscow’s defence establishment.

New Delhi’s demand for domestic integration, particularly of radar and mission systems, is viewed by Russian analysts as a subtle but significant rebuke of the capabilities of Russia’s own fifth-generation fighter architecture.

According to Indian defence sources, the primary contention revolves around the Su-57E’s N036 “Byelka” AESA radar, which is built using Gallium Arsenide (GaAs) technology and, in India’s view, fails to meet the detection range, power efficiency, and electronic warfare resilience expected of next-generation radar systems.

Indian experts contend that their own locally developed Gallium Nitride (GaN)-based AESA radars, which promise superior thermal handling, range, and signal fidelity, are more suited for high-performance fifth-generation air combat.

India is reportedly seeking to install its indigenously developed Uttam AESA radar—currently deployed on Tejas fighters—and the Virupaksha radar, being integrated into upgraded Su-30MKI aircraft under the Super-30 program, as alternatives to the Russian Byelka system.

Both systems are being developed by India’s Defence Research and Development Organisation (DRDO) and are built on GaN semiconductor architecture, enabling higher power density, longer detection ranges, and better resistance against jamming, especially in contested electromagnetic environments.

The push for domestic radar integration aligns with India’s broader Atmanirbhar Bharat (Self-Reliant India) doctrine, which aims to reduce dependence on foreign defence suppliers and promote sovereign control over critical technologies.

This confrontation over radar technology is not simply a technical dispute but a reflection of India’s growing confidence in its indigenous defence industrial base.

By demanding radar substitution, New Delhi is signaling that it no longer accepts foreign systems as superior by default, especially in sensitive areas like sensor technology and electronic warfare.

The Su-57E, which Moscow has aggressively marketed as one of the world’s most advanced fifth-generation platforms, is now being implicitly questioned on one of its core capabilities—the ability to detect, track, and engage adversaries at extended ranges.

Such a demand undermines Russia’s claim that its fighter is fully competitive with Western counterparts such as the American F-35 or the Chinese J-20, and exposes a gap in technology perception between supplier and customer.

For Moscow, the risk is twofold: India may ultimately walk away from the Su-57E if its conditions are not met, and the global perception of Russia’s flagship stealth fighter could be damaged by the optics of a major buyer rejecting its critical systems.

For India, however, the issue ties directly into its strategic ambitions of not only building the Advanced Medium Combat Aircraft (AMCA) but also fielding a defence ecosystem that can independently sustain and upgrade next-generation platforms.

The insistence on GaN-based AESA integration also places India in the league of nations pushing the technological frontier, as GaN semiconductors are increasingly seen as the standard for advanced radar and electronic warfare systems.

This debate comes at a time when New Delhi is diversifying its arms imports, balancing Russian-origin platforms with French Rafales, American P-8Is, and Israeli UAVs, reflecting its multi-vector procurement strategy.

Should India succeed in embedding its own radar on the Su-57E, it would set a precedent for future deals where local technology insertion becomes a non-negotiable term of contract.

Ultimately, the radar issue has evolved into a geopolitical litmus test of whether Russia can accommodate India’s push for self-reliance while still retaining its traditional role as New Delhi’s most important defence supplier.

The radar dispute also highlights the shifting balance in the India–Russia defence relationship, where New Delhi is no longer merely a buyer but an assertive partner demanding technological parity.

By pressing for indigenous radar integration, India is leveraging its large defence market as bargaining power, knowing that Moscow cannot easily afford to lose one of its biggest arms customers.

This standoff comes at a time when Russia’s own defence industry is under immense strain from Western sanctions and wartime demands, limiting its ability to offer concessions without undermining its prestige.

If unresolved, the disagreement could accelerate India’s pivot toward Western suppliers, especially as Washington and Paris court New Delhi with offers of advanced systems and deeper industrial cooperation.

At its core, the confrontation is a test of whether Russia can adapt to a new era where major clients like India demand not just finished products, but co-development, local content, and technological control as the price of strategic alignment.

From a technological standpoint, GaAs-based AESA radars, like the Byelka, offer reliable performance but are limited by lower thermal tolerance and power efficiency—factors that are becoming increasingly crucial in modern multi-domain air combat scenarios.

GaN-based AESA radars, in contrast, are emerging as the gold standard for fifth- and sixth-generation fighter aircraft globally, used by top-tier platforms such as the F-35’s AN/APG-81, China’s KLJ-5, and Japan’s J/F-X program.

India’s refusal to accept the standard Su-57E configuration is seen in Moscow as a challenge to Russia’s defence technological primacy, especially given the geopolitical significance of maintaining its influence over one of its largest arms clients.

To assuage Indian concerns and stay ahead of the competing American F-35A, which Washington has also quietly positioned for the Indian Air Force, Russia has reportedly offered full source code access to facilitate system-level integration of Indian-made components and software into the Su-57E.

According to Indian defence media, the Su-57E export model being proposed by Russia will incorporate elements of India’s Super-30 program, including the use of GaN-based AESA radars and locally developed mission computers—making it interoperable with India’s existing air combat ecosystem.

The Super-30 upgrade, aimed at transforming India’s frontline Su-30MKI fleet into near-5th generation multirole fighters, serves as the blueprint for India’s technology integration approach, especially for avionics, electronic warfare systems, and precision-guided weaponry.

Should India proceed with the Su-57E acquisition, the aircraft would be expected to field India-made missiles such as the Astra beyond-visual-range air-to-air missile (BVRAAM) and potentially other precision-strike munitions under development.

Such a move would not only reduce India’s long-term reliance on foreign-sourced weapon systems but also ensure software sovereignty, particularly over mission-critical systems, which India has struggled to secure in past defence procurements.

A key factor behind India’s hardened stance is the prolonged dispute with France over the Rafale’s source code, which has hindered the integration of indigenous weapons and systems onto the 4.5-generation fighter aircraft.

Despite a €7.8 billion (RM37.5 billion) deal signed in 2016 for 36 Rafale fighters, France—through Dassault Aviation—has consistently refused to share full source code access with India, even as the Indian Air Force pushes for deeper integration of missiles like the Astra Mk1 and Rudram anti-radiation missile.

While India has made progress integrating some local weapons, France’s refusal to unlock the Modular Mission Computer (MMC) and Thales RBE2 AESA radar software continues to limit the Rafale’s adaptability for Indian-specific mission profiles.

This experience has reinforced India’s defence policy to demand full source code rights and ensure that future fighter acquisitions are fully compatible with Indian-developed technologies from the outset.

To strengthen its offer, Russia has also proposed licensed local production of the Su-57E in India, with Russian Ambassador to India Denis Alipov stating:

“This aircraft (Su-57E) is very competitive, and we are offering not only to sell it, but also to collaborate on production. We are ready to transfer technology and develop the necessary industrial facilities.”

“Besides, we are open to configuration changes based on India’s requirements. This is a very attractive proposal.”

This proposal aligns with recent statements by Russia’s state arms export agency Rosoboronexport, which confirmed that India could immediately begin Su-57E production using its existing Su-30MKI production lines, where over 222 aircraft have already been built under license.

In a report published on March 7 by Russian state media outlet TASS, Rosoboronexport reaffirmed its readiness to repurpose Su-30MKI infrastructure to locally manufacture Su-57E fighters—if India finalizes the procurement deal.

“If India makes a positive decision, the production of the fifth-generation Su-57E can begin quickly at the same facilities currently building the Su-30MKI,” the statement read.

With New Delhi weighing the Russian Su-57E against America’s F-35A, the final decision may hinge less on stealth or range and more on technological autonomy, software access, and local ecosystem compatibility.

As fifth-generation air combat transitions into a new era of AI-enhanced radar, GaN-driven performance, and network-centric warfare, India’s insistence on full integration and source code control could redefine the future of multilateral defence partnerships in the Indo-Pacific.

— DEFENCE SECURITY ASIA