Question:

Which country’s Navy department has signed first reliable communication link with the Indian Navy and Pacific Naval Commands under the COMCASA pact?

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COMCASA is one of the foundational defense agreements between India and the US, enabling encrypted communications between their militaries.
Updated On: Jul 15, 2026
  • Sri Lanka
  • Japan
  • Russia
  • US
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The Correct Option is D

Approach Solution - 1

The United States Navy established the first secure communication link with the Indian Navy and Pacific Naval Commands under the Communications Compatibility and Security Agreement (COMCASA). This pact allows the two navies to share real-time operational intelligence and coordinate more effectively during joint operations and exercises.
Options (A), (B), and (C) are incorrect because this agreement is a direct outcome of the India–US defense cooperation framework.
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Approach Solution -2

The question asks which country's navy signed the first reliable communication link with the Indian Navy under COMCASA. Let's check each option.

  1. Sri Lanka: Sri Lanka is not a party to the COMCASA agreement with India, so this option does not fit.
  2. Japan: Japan has separate defence cooperation arrangements with India, but COMCASA specifically is not an India-Japan pact, so this option is incorrect.
  3. Russia: Russia has long standing defence ties with India, but COMCASA is a different, US linked agreement, so this option can be ruled out.
  4. US: The United States Navy set up the first secure communication link with the Indian Navy and Pacific Naval Commands under the Communications Compatibility and Security Agreement, allowing real time sharing of operational data between the two navies. This matches the question.

Of the four countries, only the US established this communication link with India under the COMCASA framework.

Therefore, the correct answer is US.

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Approach Solution -3

India maintains active defense partnerships with several countries, and this question narrows down which one is tied specifically to the COMCASA framework, an agreement about secure communication and real-time data sharing between navies.

  1. Sri Lanka: India and Sri Lanka do cooperate on maritime security given their shared neighborhood and coastline proximity, largely through coast guard coordination and anti-piracy patrols, but this cooperation has never extended to a foundational communications-sharing pact like COMCASA, which is reserved for a different partner altogether.
  2. Japan: Japan and India have built up defense ties in recent years through exercises such as Malabar and logistics agreements, and there is genuine naval cooperation between the two countries, yet COMCASA specifically is a bilateral instrument with a different signatory, not part of the India-Japan defense architecture.
  3. Russia: Russia has been India's most enduring defense supplier for decades, providing submarines, fighter aircraft, and missile systems, but COMCASA is a distinctly American framework built around interoperable communications equipment, so Russia's long partnership with India runs on separate agreements entirely.
  4. US: The United States and India signed COMCASA in 2018, and it was the US Navy that went on to establish the first secure, encrypted communication link with the Indian Navy and the Pacific Naval Commands under this pact, letting both militaries exchange real-time position and operational data during joint drills.

Even though India shares meaningful defense relationships with all four countries listed, COMCASA and the resulting communication link were built exclusively with the United States.

Therefore, the correct answer is US.

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