Discuss the significance of bilateral naval exercises like SLINEX in shaping India's maritime diplomacy with its Indian Ocean neighbours.

SLINEX, the India–Sri Lanka bilateral naval exercise conceptualised in 2005, completed its 12th edition at Colombo in August 2025 and its 13th at Visakhapatnam [1]. Such exercises are less about firepower than about diplomacy — they convert geographic proximity into working trust, though they remain habit rather than commitment.

Building operational trust

• Conducted in a Harbour Phase (professional and social exchanges) and Sea Phase (drills at sea), SLINEX makes interoperability routine — matched signals and procedures let the two navies act together at short notice in HADR, search-and-rescue and anti-piracy tasks [1].
• Venues alternate between Indian and Sri Lankan ports, embedding reciprocity into military diplomacy.

Instrument of strategic signalling

• Exercises operationalise SAGAR and Neighbourhood First, showing continuity in ties despite periodic friction over foreign survey-vessel port calls.
• They build capacity in smaller navies; India has committed to augmenting Sri Lanka's maritime security capability and to intensifying joint exercises and maritime surveillance [2].

Reinforcing the wider diplomatic package

• Naval drills work alongside economic engagement — the 120 MW Sampur solar project, Trincomalee development and UPI-based digital payments concluded during the Prime Minister's 2025 visit [3]. Presence built through infrastructure outlasts a week-long drill.

Limits of the bilateral format

• A drill creates no obligation: the framework Agreement on Defence Cooperation remains only at the "explore the possibility" stage [2].
• Complexity is capped by the smaller, largely coastal partner navy; both Defence Secretaries themselves agreed to increase the complexity of bilateral exercises [4].
• Transnational threats — narcotics, trafficking, cyber — exceed two navies, which is why the Colombo Security Conclave, whose 7th NSA-level meeting was held in November 2025, carries the regional network [5].

Exercises like SLINEX are therefore the visible, confidence-building layer of a wider maritime strategy. Their value will grow as each edition adds harder drills, as bilateral practice is mainstreamed into Colombo Security Conclave standard procedures, and as sustained habit matures into a signed defence framework — anchoring India's vision of a secure, cooperative and shared Indian Ocean.