Hypersonic Weapons and India's BrahMos – Strategic Implications

What Are Hypersonic Weapons?

Hypersonic weapons travel at Mach 5 or above, combining the speed of ballistic missiles with the manoeuvrability of cruise missiles. They fly at lower altitudes (20–100 km) compared to ballistic missiles (which peak at hundreds of kilometres), making them harder to track using existing radar networks. There are two primary categories:

• Hypersonic Glide Vehicles (HGV): Launched by rockets to high altitude, then glide at hypersonic speeds unpowered — e.g., China's DF-ZF, Russia's Avangard.

• Hypersonic Cruise Missiles (HCM): Powered throughout the flight by a scramjet engine — e.g., BrahMos-II (planned), US X-51A Waverider.

BrahMos: India's Premier Strike Missile

BrahMos is a two-stage supersonic cruise missile: a solid-fuel booster provides initial thrust; a ramjet engine (using atmospheric oxygen) sustains flight. It uses 'fire and forget' guidance, combining inertial navigation with GPS and active radar homing.

• Land-attack variant: Inducted by Indian Army in 2007; precision-strike against hardened targets

• Naval variant: Indian Navy inducted in 2005 on INS Rajput

• Air-launched (BrahMos-A): Modified version for Sukhoi-30MKI; test-fired successfully

• BrahMos-NG: Lighter, smaller version (length 5m vs 8.4m); for fighter aircraft integration

• Export significance: Philippine deal (2024) marks India's emergence as a defence exporter

BrahMos-II: The Hypersonic Leap

BrahMos-II is a joint development project aimed at creating a hypersonic version (Mach 6–7) using a scramjet engine. However, the programme faces:

• Cost challenges: Estimated unit cost of $12.5 million vs $3–4.5 million for BrahMos-I

• Technology transfer gaps: Russia's reluctance to share full scramjet technology

• Timeline delays: Initial testing now pushed to 2027–28

India is simultaneously pursuing indigenous alternatives to reduce dependence on Russia.

India's Indigenous Hypersonic Programme

• HSTDV (Hypersonic Technology Demonstrator Vehicle): DRDO's scramjet-powered vehicle successfully tested at Mach 6 in September 2020; foundational tech for future HCMs.

• ET-LDHCM: Extended-Range Long-Duration Hypersonic Cruise Missile under development

• Dhvani: Another indigenous programme focused on affordability

• LR-ASHM: Long-Range Anti-Ship Hypersonic Missile under DRDO

Strategic Implications for India

The development of hypersonic weapons significantly alters the regional deterrence calculus in South Asia and the Indo-Pacific:

• Against China: China's DF-ZF HGV and PHL-03 systems create pressure on India's eastern theatre; India's own HGV/HCM would provide a credible second-strike capability.

• Against Pakistan: BrahMos already provides conventional deterrence; hypersonic version would make interception nearly impossible.

• Naval security: BrahMos-armed fleet (target: all warships by 2030) ensures sea denial capability in the Indian Ocean Region.

• Escalation risks: Hypersonic weapons can compress decision-making time, raising risks of miscalculation in a crisis.

• Arms race dynamics: Hypersonic competition between US-Russia-China creates pressure on India to accelerate development.

Important Concepts/Subtopics

Scramjet vs Ramjet

A ramjet compresses incoming air using the missile's forward motion but requires a booster to reach operational speeds (~Mach 3). A scramjet (supersonic combustion ramjet) allows combustion at supersonic airflow speeds, enabling sustained Mach 5+ flight. This is the technological key to hypersonic cruise missiles.

Deterrence Theory & Hypersonics

Traditional deterrence rests on assured retaliation. Hypersonic weapons threaten prompt global strike capabilities — the ability to hit any target on Earth within one hour. This challenges nuclear stability because:

• Target states may not distinguish hypersonic conventional strike from nuclear strike, triggering nuclear response.

• Compressed warning times reduce space for diplomatic de-escalation.

Arms Control Gap

Unlike ballistic missiles (covered partly by New START and INF treaties), hypersonic weapons lack any international arms control framework. This regulatory vacuum poses global security risks and is a growing concern at the UN.

Current Relevance

• Operation Sindoor (2025): Demonstrated BrahMos's precision-strike capability; strategic signalling to Pakistan

• India-Philippines BrahMos deal (2024): $375 million; marks India's entry as tier-2 defence exporter

• HSTDV tests progressing; BrahMos-NG slated for maiden flight by 2026

• China's hypersonic advances (DF-ZF, DF-17) driving India's accelerated domestic programme

• Russia-Ukraine war: Kinzhal hypersonic missile use highlighting real-world military utility