Bilateral naval exercises are instruments of strategic signalling short of alliance. Examine with reference to India's maritime engagement with the Republic of Korea.

On 26 October 2026, INS Sahyadri, an indigenously built guided missile stealth frigate, reached Busan for the IN–RoKN Bilateral Exercise. Its stated aims are interoperability and "enduring partnerships", not a defence pact [1]. That makes it a clear case of signalling without alliance, though the signal is still thin.

How the exercise signals

• Continuity: This edition follows the inaugural exercise of October 2025 [2], so the two navies are turning a one-off event into a habit.
• Convergence: It gives the Special Strategic Partnership (2015) a practical form at sea. ROK also joined the IPOI in April 2026 [2].
• Reciprocity: ROKS Gang Gam-chan joined MILAN and IFR-2026, and a RoKN delegation attended the IONS Chiefs' Conclave [2]. This carries Act East into Northeast Asia.
• Capability: An indigenous frigate shows off Aatmanirbhar shipbuilding [1].

Why it stops short of alliance

• The format is low-commitment: a harbour phase of cross-deck visits, sports and courtesy calls, then "coordinated maritime activities" at sea [1].
• The navies face different theatres: India's navy centres on the IOR, while ROK's concerns lie on the Korean peninsula. India also keeps its strategic autonomy.
• The links are institutional, not treaty-based: the main forum is the biennial Navy Staff Talks [2].

Limits of the signal

• The exercise has no fixed name or cycle, and the 2026 release does not number the edition [1].
• India has sent a single frigate both times [1][2], which rules out task-group drills such as anti-submarine screening.
• Industrial ties have not reached the navy. A CCS-approved shipbuilding MoU with HSL dates from 2017 [3], but no warship has followed. The co-production success, K9 Vajra, is a land system [2].
• A trade deficit of about USD 15 billion in 2024–25 [5] weakens support for the partnership at home.

Way forward

• Fix a name and schedule through Staff Talks, and add a second ship or a maritime patrol aircraft.
• Put naval maintenance, repair and spares on the Joint Committee on Defence Industries agenda [4].
• Plan the VOYAGES Thoothukudi yard (2.5 million GT) [6] so it can also build naval auxiliaries.
• Finish the CEPA upgrade by early 2027 [5].

India–ROK naval engagement shows that exercises can signal convergence without the commitments of an alliance. Making the exercise regular and linking it to defence-industrial cooperation would turn that signal into real capability. This fits MAHASAGAR and the IPOI vision of a free, open, rules-based Indo-Pacific.