Discuss the strategic significance of India's defence cooperation with Indonesia in the context of India's Act East Policy.

Indonesia, ASEAN's largest economy and a fellow maritime democracy astride the Indian Ocean–Pacific junction, is a natural pillar of India's Act East Policy. PM Modi's State Visit (6–8 July 2026), which deepened the Comprehensive Strategic Partnership, made defence its centrepiece — signalling a shift from diplomatic outreach to hard-security convergence [1][2].

Defence-export diplomacy

• Cooperation on the BrahMos Missile System and an Air-to-Air (Astra) Missile Agreement make Indonesia a key buyer, after the Philippines and Vietnam [3].
• Advances Aatmanirbhar Bharat in defence and builds strategic dependencies that anchor partners to India.

Maritime & Indo-Pacific security

• Both are Indo-Pacific maritime nations; the extended Maritime Safety and Security arrangement strengthens Coast Guard coordination and domain awareness [1].
• An Indonesian liaison officer at IFC-IOR (Gurugram) enhances shared maritime-domain awareness near the Malacca chokepoint and Six Degree Channel [1].

Interoperability

• Institutionalised exercises — army Garuda Shakti, naval Samudra Shakti, and IND-INDO CORPAT — build habits of cooperation and jointness [4].

Strategic convergence

• Both share concerns over an assertive China; ties reinforce ASEAN centrality and a free, open, rules-based Indo-Pacific.

Challenges persist — Indonesia's non-aligned instinct, competing arms suppliers, and financing constraints temper the pace.

Anchored in shared maritime geography and democratic values, India–Indonesia defence cooperation transforms Act East from connectivity rhetoric into a security architecture. Sustained through regular summits and co-production, it can make the partnership a load-bearing beam of Indo-Pacific stability.