Defence★ Must Know

India and Japan sign first defence co-development pact for UNICORN mast

By TestNeeti Editorial TeamPublished Thursday, 2 July 2026 2 min readSource: GKTodayArticle 7 of 21

On 2 July 2026, India and Japan signed their first-ever defence co-development agreement during the 16th India-Japan Annual Summit in New Delhi. The pact covers joint development of the Naval Radio Antenna 'Unicorn', also called the UNICORN mast, which stands for Unified Complex Radio Antenna. The system integrates multiple antennas into a single structure to improve the stealth characteristics of warships and supports communication, radar and electronic systems. The agreement was announced by Prime Minister Narendra Modi and Prime Minister Sanae Takaichi. The summit also covered artificial intelligence, economic security, critical minerals, healthcare and energy, deepening bilateral cooperation between the two maritime democracies.

Key Facts & Details

9 points

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India and Japan signed their first defence co-development agreement on 2 July 2026 during the 16th India-Japan Annual Summit held in New Delhi.
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The pact covers co-development of the Naval Radio Antenna 'Unicorn', known as the UNICORN mast, for naval platforms.
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UNICORN stands for Unified Complex Radio Antenna and integrates multiple antennas into a single structure to enhance warship stealth.
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The agreement was announced by Prime Minister Narendra Modi and Japanese Prime Minister Sanae Takaichi.
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A Memorandum of Implementation for the UNICORN mast was signed in November 2024 at the Embassy of India, Tokyo.
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The summit also spanned cooperation in artificial intelligence, economic security, critical minerals, healthcare and energy.

Deep Dive

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The 3rd India-Japan 2+2 Foreign and Defence Ministers' Meeting was held in August 2024, reflecting a steady institutional defence dialogue.
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Defence co-development is a form of industrial cooperation where two countries jointly develop a military system, linked here to maritime security, supply-chain resilience and strategic autonomy.
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The project is significant against the backdrop of Japan's defence export policy, which has historically imposed self-restrictions on military exports.

Exam Focus

Examiners may ask what UNICORN stands for, the summit at which the pact was signed, or the two countries involved in the first India-Japan defence co-development project.

Exam Relevance & Angle

The pact marks a milestone in India-Japan strategic ties, moving beyond procurement to genuine co-development of defence technology. It strengthens India's naval capability, supports Make in India in defence and signals Japan's gradual easing of export self-restrictions.

Target Exams

UPSC CSESSC CGLRRB NTPCState PCSSBI POIBPS PO

Background & Context

The UNICORN (Unified Complex Radio Antenna) mast is a next-generation warship antenna system that houses multiple communication and radar antennas within one composite structure, reducing the radar cross-section and improving a vessel's stealth profile. India and Japan have progressively expanded defence engagement through the 2+2 Foreign and Defence Ministers' dialogue, acquisition and cross-servicing arrangements, and annual leaders' summits. Japan has traditionally maintained strict self-imposed curbs on exporting military hardware, so any co-development effort represents a notable policy shift. The Annual Summit mechanism has anchored the bilateral special strategic and global partnership for over a decade.