ISRO-ESA broaden co-operation agreement to include human and robotic exploration
ISRO and the European Space Agency (ESA) signed an exchange of letters in Paris on September 10, 2026, extending their bilateral Cooperative Agreement by five years, until January 8, 2032
The agreement was signed by ESA Director General Josef Aschbacher and ISRO Chairman V. Narayanan on the sidelines of the International Space Summit
The scope of cooperation was broadened to formally include space weather and human and robotic exploration, alongside recognition of the growing importance of outer space sustainability
The extension builds on the original ISRO-ESA Cooperative Agreement (in force since January 2002) and a 2025 Joint Statement of Intent on human exploration
Both agencies indicated future collaboration areas under discussion: ESA astronaut flight opportunities to India's planned space station and joint interest in future Moon and Venus missions
Instruments of Bilateral Space Cooperation
International space cooperation is conducted through a hierarchy of legal instruments with differing degrees of bindingness. A Cooperative Agreement (as between ISRO-ESA) or a bilateral Memorandum of Understanding (MoU) typically sets out a framework for cooperation without creating binding international legal obligations, unlike a Treaty, which requires ratification and is legally binding. A Joint Statement of Intent signals political commitment to explore cooperation in a specific area without firm deliverables — the precursor step ISRO and ESA used in 2025 before broadening the binding Cooperative Agreement in 2026 to formally cover human exploration.
Key Details
- ISRO-ESA's original Cooperative Agreement entered into force in January 2002 and has covered Earth observation, satellite navigation, space science, and mission operations support (e.g., ESA ground-station support for Indian missions)
- The 2026 exchange of letters is an amendment/extension mechanism, not a fresh treaty — it extends validity to January 8, 2032 and adds space weather, human and robotic exploration, and space sustainability as named areas
- ISRO similarly maintains bilateral frameworks with NASA (under the India-US Initiative on Critical and Emerging Technologies, iCET), Roscosmos, JAXA, and CNES, reflecting India's "multi-alignment" approach to space diplomacy
The 2026 extension is a textbook example of a non-treaty bilateral instrument being progressively broadened in scope over successive renewal cycles, moving from earth-facing applications (navigation, Earth observation) toward deep-space and human exploration cooperation.
European Space Agency (ESA)
ESA is an intergovernmental organisation dedicated to space exploration, distinct from the EU. It was established in 1975 through the merger of the European Launcher Development Organisation (ELDO) and the European Space Research Organisation (ESRO), and is headquartered in Paris, France.
Key Details
- ESA has 23 full member states (including non-EU members such as the UK, Norway, and Switzerland) plus associate members (Latvia, Lithuania, Slovakia, and Cyprus, the latter joining in 2026)
- ESA membership is independent of EU membership, illustrating that space cooperation architecture need not mirror regional political-economic blocs
- ESA operates major programmes including the Ariane launch vehicle family, the Copernicus Earth-observation programme, and contributions to the International Space Station (ISS) and Artemis programme (e.g., the Orion capsule's European Service Module)
ESA's institutional breadth (23 member states pooling resources) makes it a natural partner for India's expanding, resource-intensive human spaceflight ambitions, complementing India's parallel bilateral engagement with the US and Russia.
Bharatiya Antariksh Station (BAS) — India's Planned Space Station
The Bharatiya Antariksh Station is India's planned indigenous space station, envisioned as a modular orbital facility to be built and operated after the Gaganyaan human spaceflight programme matures.
Key Details
- Planned as a five-module configuration (base, core, science lab, and common working modules), with the first module (BAS-01) targeted for launch around 2028 and full operational capability targeted by 2035
- Modules are to be launched using the human-rated LVM3, LVM3-SC (semi-cryogenic variant), and future Next Generation Launch Vehicles (NGLV)
- Four dedicated precursor missions between 2026 and 2028 are planned to validate life-support, docking, robotics, and long-duration habitation technologies
The broadened ISRO-ESA agreement explicitly opens the door to ESA astronaut flight opportunities aboard the future BAS, positioning India as a potential host for international astronauts akin to how the ISS currently hosts multinational crews.
India's Human Spaceflight Diplomacy
India's human spaceflight programme (Gaganyaan) is increasingly being used as a platform for international partnerships, alongside India gaining direct astronaut experience through third-party missions.
Key Details
- In July 2025, Wing Commander Shubhanshu Shukla became the second Indian in space (after Rakesh Sharma in 1984) and the first Indian to visit the International Space Station, flying as pilot on the privately organised Axiom Mission 4 (Ax-4), a collaboration involving Axiom Space, NASA, SpaceX, and ISRO
- India has been deepening space cooperation with the US under the Artemis Accords framework and the bilateral iCET initiative
- Gaganyaan's first crewed flight is targeted for early 2027, preceded by uncrewed qualification missions
The ISRO-ESA agreement extension is part of a broader pattern of India converting its maturing human spaceflight capability into diplomatic currency, engaging multiple spacefaring blocs (US-led Artemis Accords, European ESA, and Russian heritage cooperation) simultaneously rather than aligning exclusively with one.
- Agreement signed: September 10, 2026, in Paris
- Extended validity: until January 8, 2032 (a five-year extension)
- Original ISRO-ESA Cooperative Agreement: in force since January 2002
- Signatories: ESA Director General Josef Aschbacher; ISRO Chairman Dr. V. Narayanan
- ESA: founded 1975, headquartered in Paris, 23 member states + 4 associate members (as of 2026)
- Bharatiya Antariksh Station: 5-module design; first module (BAS-01) targeted 2028; full operational capability targeted 2035
- Gaganyaan's first crewed flight: targeted first quarter of 2027