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Subject: Defence

  • Guardians of India’s Maritime Frontiers

    Why in News?

    The Indian Navy recently commissioned INS Mahendragiri, INS Dunagiri, INS Sanshodhak, and INS Agray, strengthening India’s indigenous maritime capabilities.

    Key Highlights

    • Three indigenous naval classes strengthen India’s layered maritime security:
      • Nilgiri Class: Stealth Frigates (Project 17A)
      • Sandhayak Class: Survey Vessel (Large)
      • Arnala Class: Anti-Submarine Warfare Shallow Water Craft (ASW-SWC)
    • Designed by the Warship Design Bureau (WDB) with high indigenous content under Aatmanirbhar Bharat.
    • Protect India’s 11,098 km coastline, 2.4 million sq km Exclusive Economic Zone (EEZ), and sea lanes carrying ~90% of India’s trade by volume.

    About the Three Classes

    • Nilgiri Class (Project 17A): Next-generation stealth guided missile frigates for anti-air, anti-surface, and anti-submarine warfare.
      • Equipped with BrahMos missiles, advanced radar, sonar, and helicopters.
    • Sandhayak Class: Conducts hydrographic surveys, seabed mapping, and nautical charting.
      • Supports the Blue Economy, navigation safety, and disaster relief.
    • Arnala Class: Designed for coastal anti-submarine warfare in shallow waters.
      • Equipped with lightweight torpedoes, ASW rockets, and shallow-water sonar.

    Strategic Significance

    • Strengthens Aatmanirbhar Bharat through indigenous shipbuilding.
    • Supports SAGAR (Security and Growth for All in the Region) and MAHASAGAR (Mutual and Holistic Advancement for Security and Growth Across Regions) visions.
    • Enhances maritime security, defence exports, and the Blue Economy.

    [2016] Which one of the following is the best description of ‘INS Astradharini’, that was in the news recently?

    [A] Amphibious warfare ship

    [B] Nuclear-powered submarine

    [C] Torpedo launch and recovery vessel

    [D] Nuclear-powered aircraft carrier

  • DRDO Successfully Tests Pinaka Long Range Guided Rocket

    Why in News?

    The Defence Research and Development Organisation (DRDO) successfully conducted a flight test of the Pinaka Long Range Guided Rocket (LRGR) from the Integrated Test Range (ITR), Chandipur, Odisha. The test validated its user defined minimum strike range of 60 km and demonstrated high precision strike capability.

    Key Highlights

    • Successfully validated the minimum strike range of 60 km.
    • The rocket executed all planned in flight manoeuvres and accurately hit the designated target.
    • It followed the predicted trajectory with high precision.
    • Launched from an in service Pinaka launcher, demonstrating compatibility with multiple Pinaka rocket variants.
    • This enhances operational flexibility for the Indian Army.

    Development

    • Designed by the Armament Research and Development Establishment (ARDE), Pune.
    • Developed in collaboration with the High Energy Materials Research Laboratory (HEMRL), Pune.
    • Supported by the Defence Research and Development Laboratory (DRDL), Hyderabad and Research Centre Imarat (RCI), Hyderabad.
    • Flight trial coordinated by the Integrated Test Range (ITR) and Proof and Experimental Establishment (PXE), Chandipur.

    About Pinaka Rocket System

    • Pinaka is an indigenously developed Multi Barrel Rocket Launcher (MBRL).
    • Developed by DRDO for the Indian Army.
    • Named after Lord Shiva’s bow, Pinaka.
    • Provides rapid, high volume artillery fire against enemy positions.
    • Mounted on a high mobility vehicle.
    • Can fire 12 rockets in about 44 seconds.
    • Suitable for: Area suppression, Counter battery fire, Destruction of troop concentrations, and Neutralising enemy logistics and command centres

    Pinaka Variants

    • Pinaka Mk I: Range of about 37 to 40 km.
    • Guided Pinaka: Precision guided rocket with a range of about 75 km.
    • Pinaka Enhanced Range (ER): Range of about 90 km.
    • Pinaka Long Range Guided Rocket (LRGR): Maximum range of about 120 km, while the latest test validated a user defined strike range of 60 km.

    [2023] Consider the following statements
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of fight.
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.
    Which of the statements given above is/are correct?

    [A] 1 only

    [B] 2 only

    [C] Both 1 and 2

    [D] Neither 1 nor 2

  • INS Mahendragiri (Project 17A Stealth Frigate)

    Why in News?

    The Indian Navy will commission INS Mahendragiri (F38), the sixth Project 17A indigenous stealth frigate, at Visakhapatnam on 11 July 2026.

    Note: Project 17A is a ₹45,000-crore Indian Navy initiative to build seven advanced Nilgiri-class stealth frigates.

    Key Highlights

    • Named after the Mahendragiri Hills in the Eastern Ghats.
    • Designed by the Indian Navy’s Warship Design Bureau (WDB).
    • Built by Mazagon Dock Shipbuilders Limited (MDL), Mumbai.
    • Features over 75% indigenous content, supporting Aatmanirbhar Bharat.
    • Powered by Combined Diesel or Gas (CODOG) propulsion for high speed and long endurance.

    Features

    • Advanced stealth design with reduced radar signature.
    • Equipped with:
      • Surface-to-Surface Missiles (SSM)
      • Surface-to-Air Missiles (SAM)
      • Electronic Warfare (EW) systems
      • Anti-Submarine Warfare (ASW) systems
      • Integrated Combat Management System (CMS)
    • High degree of automation and enhanced survivability.

    Operational Roles

    • Anti-air warfare, Anti-surface warfare, Anti-submarine warfare, Maritime security, Humanitarian Assistance and Disaster Relief (HADR), Search and Rescue (SAR), and Indo-Pacific presence missions

    Significance

    • Strengthens India’s indigenous warship-building capability.
    • Enhances the Indian Navy’s blue-water combat capability.
    • Boosts the domestic defence ecosystem, including MSMEs.
    • Reinforces India’s role as the Preferred Security Partner in the Indian Ocean Region.

    [2026] Which of the following statements with regard to stealth technology is/are correct ?
    1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material.
    2. Stealth objects can be detected using specific frequencies.
    3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation.
    Select the answer using the code given below :

    [A] 1 only

    [B] 2 and 3 only

    [C] 1 and 2 only

    [D] 1, 2 and 3

  • What India’s 12 ‘operationally deployed’ nuclear warheads mean

    Why in the News?

    SIPRI’s 2026 Yearbook classified 12 of India’s 190 nuclear warheads as operationally deployed for the first time. These are positioned with active military forces mated with delivery systems and ready for use.The classification has triggered concern over a possible shift in India’s No First Use (NFU) doctrine.

    Why does SIPRI’s “deployment” classification not indicate a shift in India’s nuclear doctrine?

    1. No change in launch policy: NFU commits India to not launching a pre-emptive strike; SIPRI’s report records no revision of this commitment.
    2. No threshold lowering: The report does not indicate any lowering of the threshold for nuclear employment.
    3. No change in political control: Civilian and political oversight mechanisms governing nuclear release remain unaltered.
    4. Expert confirmation: Warheads mated with delivery platforms make assured retaliation more credible, not less restrained.
    5. Reaffirmed commitment: India’s representatives reaffirmed NFU and non-use against non-nuclear-weapon states at the UN High-Level Meeting in September 2025.
    6. Internal calls for first-use rejected: Periodic domestic proposals for a conditional or hybrid first-use posture have not prevailed.

    Why does the stockpile-deployment distinction matter for assessing India’s posture?

    Possessing a warhead and deploying it as part of an operational deterrent are not the same condition. The distinction determines whether a count of warheads signals readiness or merely holdings.

    1. De-mated baseline: For most of its nuclear history, India stored warheads separately from delivery vehicles at a central site under strict oversight.
    2. Purpose of de-mating: This was meant to maximise safety, reduce accidental-use risk, and signal restraint internationally.
    3. Definition of deployment: Deployment pairs a warhead with a delivery system and positions it with operational forces in readiness.
    4. Readiness, not intent: A deployed weapon is configured for use if authorised; it is not a signal of imminent use.
    5. Speed differential: A de-mated weapon needs time to prepare and deploy; a mated weapon can be launched faster.
    6. Scale of the shift: SIPRI’s count reflects a small but significant fraction of India’s arsenal now held in operational readiness, not a wholesale change in posture.

    How does the sea-based deterrent resolve the central vulnerability in India’s NFU doctrine?

    NFU is a retaliation-only doctrine, so it stands or falls on whether the force can survive a first strike. Sea-basing closes the specific gap that land-based deployment cannot.

    1. Survivability requirement: NFU depends on enough of the arsenal surviving a first strike to deliver a retaliatory blow; without this, NFU becomes a liability rather than a doctrine.
    2. Land-based vulnerability: Land-based missiles sit at known, mappable locations and can be targeted in a disarming first strike.
    3. Sea-based advantage: A submerged submarine cannot be found, tracked, or destroyed in time, removing this vulnerability.
    4. Arihant-class platform: India’s Arihant-class submarines have steadily strengthened second-strike survivability, with additional platforms expected to further consolidate this leg of the triad.
    5. Operational milestone: Three operational SSBNs allow India to keep at least one submarine submerged and on patrol at all times.
    6. Supporting readiness measure: Increasing reliance on canisterised Agni-series missiles, which carry fuel sealed and ready, raises operational readiness without requiring further preparation before launch.

    What broader trend does India’s deployment milestone sit within, and why does it matter?

    1. Global reversal: SIPRI’s 2026 Yearbook records states increasingly relying on nuclear weapons as instruments of national power, reversing decades of gradual disarmament progress.
    2. Scale of global arsenals: Nine nuclear-armed states held an estimated 12,187 warheads as of January 2026.
    3. China’s pace: China’s arsenal has grown to approximately 620 warheads, expanding faster than any other nuclear power and now over three times Pakistan’s estimated stockpile.
    4. Dual-direction posture: India’s modernisation is increasingly focused on long-range systems capable of reaching China, while continuing to account for Pakistan.
    5. Weakening arms control: Arms-control agreements have weakened or collapsed even as competition intensifies in hypersonic delivery, AI-enabled decision support, missile defence, and anti-submarine warfare.
    6. Unresolved risk: The maturation of India’s second-strike capability strengthens deterrence bilaterally, but does nothing to address the rising risk of miscalculation across a destabilising global order.

    Conclusion

    SIPRI’s classification of 12 Indian warheads as operationally deployed documents the maturing of India’s sea-based second-strike capability, not a retreat from No First Use. This development, however, sits inside a global environment where arms-control frameworks are weakening and major powers are re-arming. The institutions designed to manage nuclear risk must adapt to this faster-fielding environment, or the credibility gained through India’s improved deterrent will be offset by a rising structural risk of miscalculation.

    PYQ Relevance

    [UPSC 2017] Give an account of the growth and development of nuclear science and technology in India. What is the advantage of fast breeder reactor programme in India?

    Linkage: Tests India’s strategic nuclear capabilities, indigenous nuclear development and the evolution of its deterrence architecture.The article explains how India’s maturing nuclear triad and operational deployment strengthen its credible minimum deterrence and second-strike capability without altering its No First Use doctrine.

  • Netra AEW&C System Receives Final Operational Clearance (FOC)

    Why in the news?

    The Defence Research and Development Organisation (DRDO) has handed over the Final Operational Clearance (FOC) certificate of the indigenous Netra Airborne Early Warning & Control (AEW&C) system to the Indian Air Force (IAF). The system had received Initial Operational Clearance (IOC) in 2017.

    What is Netra AEW&C?

    • Netra is an Airborne Early Warning and Control (AEW&C) system developed indigenously by DRDO’s Centre for Airborne Systems (CABS) in collaboration with the IAF and Indian industry.
    • Mounted on a modified Embraer ERJ-145 aircraft.
    • Functions as a “flying radar”, providing airborne surveillance, early warning, command and battle management.

    Key Features

    • 360° situational awareness through networked surveillance.
    • Detects and tracks: Fighter aircraft, Cruise missiles, Drones/UAVs, Helicopters, and Surface targets.
    • Provides: Airspace surveillance, Threat detection, Target tracking, Battle management, and Command and control support.
    • Enhances interoperability with ground-based and airborne assets.

    Prelims Pointers

    • AEW&C: Airborne Early Warning and Control system for surveillance and battle management.
    • FOC (Final Operational Clearance): Certification that a defence system is fully operational and combat-ready.
    • IOC (Initial Operational Clearance): Limited operational induction after successful initial trials.
    • CABS: Centre for Airborne Systems, a DRDO laboratory responsible for airborne surveillance systems.

    [2025] With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements:
    I. All types of UAVs can do vertical landing.
    II. All types of UAVs can do automated hovering.
    III. All types of UAVs can use battery only as a source of power supply.
    How many of the statements given above are correct?

    [A] Only one

    [B] Only two

    [C] All the three

    [D] None

  • SAIL Supplies Defence Grade Steel for Indian Navy Warships

    Why in News?

    The Steel Authority of India Limited (SAIL) supplied 5,700 tonnes of indigenous defence grade steel for three Indian Navy ships, INS Dunagiri, INS Agray, and INS Sanshodhak, commissioned on 21 June 2026. The move strengthens India’s defence indigenisation under Atmanirbhar Bharat and Make in India.

    Key Highlights

    • SAIL supplied 100% of the special steel requirement (5,700 tonnes) for INS Dunagiri (Stealth Frigate), INS Agray (ASW Shallow Water Craft), and INS Sanshodhak (Survey Vessel)
    • Steel supplied DMR 249A grade hot rolled sheets and plates (Defence grade steel).
    • Manufactured at Bokaro Steel Plant, Bhilai Steel Plant, and Rourkela Steel Plant
    • Production of DMR grade plates has been expanded, especially at the Special Plate Plant, Rourkela, to meet defence needs.

    What is DMR 249A Steel?

    • DMR (Defence Metallurgical Research) 249A is a high strength, low alloy steel developed for naval warships.
    • Features: High tensile strength, Excellent weldability, High toughness, Corrosion resistance in marine environments, and Better survivability under combat conditions.
    • Other Major Naval Platforms Using SAIL Steel: INS Vikrant, INS Nilgiri, INS Himgiri, INS Udaygiri, INS Ajay, INS Nistar, and INS Anjadeep

    Significance

    • Enhances self reliance in defence manufacturing.
    • Reduces dependence on imported naval steel.
    • Strengthens India’s indigenous shipbuilding capability.
    • Supports strategic maritime security and blue water naval ambitions.
    • Demonstrates collaboration between public sector steel manufacturing and defence production.

    [2016] Which one of the following is the best description of ‘INS Astradharini’, that was in the news recently?

    [A] Amphibious warfare ship

    [B] Nuclear-powered submarine

    [C] Torpedo launch and recovery vessel

    [D] Nuclear-powered aircraft carrier

  • How is S-400 air defence system technically superior to any other system presently available in the world?

    The S-400 Triumf, developed by Russia’s Almaz-Antey, is widely regarded as one of the most potent long-range Surface-to-Air Missile (SAM) systems.

    Technical Superiority of the S-400 System

    Multi-Missile Capability: Unlike other systems that fire a single type of missile, the S-400 can launch four different types of missiles.

    Unmatched Range and Reach: Its longest-range missile (40N6E) can engage targets at 400 km, nearly double the effective range of the Patriot PAC-3 (approx. 160-180 km).

    360-Degree Coverage: The S-400 uses cold-vertical launch technology. This provides 360-degree coverage, whereas the Patriot is a “tilted” launcher that must be rotated to face the threat.

    Target Engagement Capacity: A single S-400 battalion can track up to 300 targets and engage 36 targets simultaneously with 72 missiles.

    High Mobility and Deployability: The entire system is truck-mounted and can be deployed or packed up in 5 to 10 minutes.

    Hypersonic Target Engagement: The system is designed to intercept targets traveling at speeds up to Mach 14, making it capable of countering most modern tactical ballistic missiles.

    Anti-Electronic Warfare Protection: The S-400 are equipped with advanced frequency-hopping and electronic counter-countermeasures, making them highly resistant to jamming.

    Interoperability: It can be integrated into existing air defense networks, acting as a “Command and Control” hub for a country’s entire airspace.

    Altitude Versatility: It can engage targets as low as 10 meters (cruising drones) and as high as 30 km (near-space aircraft/ballistic missiles)

    While the US Patriot system is highly battle-proven and excels in point-defense, the S-400 offers an “Area Denial” (A2/AD) capability that is unmatched in terms of range, target variety, and rapid response.

  • Consider the following statements

    Consider the following statements :
    1. INS Sindhughosh is an aircraft carrier.
    2. INS Viraat is a submarine.
    Which of the statements given above is/are correct ?

  • Consider the following statements

    Consider the following statements:
    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of flight.
    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.
    Which of the statements given above is/are correct?

  • Indigenous Air Cushion Vehicle (ACV) Inducted into Indian Coast Guard

    Why in News?

    The Indian Coast Guard (ICG) inducted the first of six indigenously built Air Cushion Vehicles (ACVs), or hovercraft, at Goa on 18 June 2026. The vessels are being constructed by Chowgule & Company Private Limited under a Ministry of Defence contract.

    Key Highlights

    • First ACV inducted into ICG service in Goa.
    • Part of a contract for six indigenous hovercraft.
    • Contract signed between the Ministry of Defence and Chowgule & Company Pvt. Ltd. on 24 October 2024.
    • Supports the vision of Aatmanirbhar Bharat.
    • Enhances India’s indigenous maritime manufacturing capability.

    What is an Air Cushion Vehicle (ACV)?

    • A hovercraft that travels on a cushion of pressurised air.
    • Can operate over Water, Mudflats, Marshes, Sandbanks, Shallow and coastal areas
    • Combines features of both marine vessels and aircraft.