India has finally received its fourth S-400 Triumf squadron from Russia. The contract was formally signed on 5 October 2018 at a deal value of 5.43 billion dollars — ₹40,000 crore — for the delivery of five S-400 regiments.
As per the Indian Ministry of Defence’s own statements to Parliament, deliveries were supposed to commence from October 2020 and be completed by April 2023. By that deadline, however, India had received only three of the five contracted regimental sets — a delay attributable primarily to the Russia-Ukraine war, which began in February 2022. The fourth squadron’s arrival has been met with near-unanimous celebration across India’s defence establishment and media, hailed as a landmark moment in the country’s air defence journey. And there is genuine cause for acknowledgement: the system’s combat debut during Operation Sindoor, where it reportedly downed a Pakistani surveillance aircraft at over 300 km, proved its operational value beyond doubt. But to treat a delayed, partial delivery of a foreign-built system as a measure of India’s defence prowess would be to mistake an import for an achievement. Here is why.
Before getting into the details, it is important to understand what the S-400 actually is. The S-400 Triumf is a Russian long-range surface-to-air missile system designed to detect and engage enemy aircraft, cruise missiles, ballistic missiles, and drones. It can detect targets up to 600 km away and engage them at ranges of up to 400 km, depending on the target type. It can track and engage multiple targets simultaneously.
A full unit of the air missile system consists of radar systems to detect and track threats, command posts to process data and decide what to shoot, and launchers loaded with different types of missiles for different ranges and altitudes. The system automatically selects the right missile for the right threat. Most air defence systems specialise in defending against specific threats — ballistic missiles, aircraft, or cruise missiles. The S-400 uniquely integrates the ability to detect and engage all major aerial threats within a single system, which is relatively rare. This versatility, combined with its long range, makes it one of the most capable air defence systems in the world but with a low-tier dominance.
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The S-400’s Formidable Low-Tier Dominance
The S-400 Triumf forms the backbone of India’s long-range air defence, excelling against threats that operate within the atmosphere. With a detection range of 600 km and an engagement capability of up to 400 km, the system is masterfully designed to neutralise aircraft, unmanned aerial vehicles, and
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