China-Iran Strategic Partnership Challenges India's Regional Interests
China and Iran have been strengthening their diplomatic relationship since 1971, which has evolved into a strategic partnership driven by energy security, economic interests, geopolitical calculations, and a shared opposition to US pressure. This partnership does not constitute a mutual-defense pact or formal alliance but has significant implications for India's energy, connectivity, and regional interests.
The relationship gained momentum in 2016 when Beijing and Tehran established a comprehensive strategic partnership, with China opposing US sanctions on Iran and continuing to purchase Iranian oil despite the restrictions. In 2021, they signed a 25-year cooperation program covering energy, infrastructure, transportation, telecommunications, and industry, with an estimated $400 billion worth of investment.
Energy remains the foundation of this relationship, as China is the world's largest crude-oil importer and Iran possesses approximately 12% of the world's proved oil reserves. US sanctions have limited Iran's access to conventional international markets, making China its primary petroleum customer, with Chinese purchases accounting for around 90% of Iran's oil exports in 2025.
China's defense cooperation with Iran is more complicated, with publicly verifiable evidence of major recent weapons deliveries limited. However, reports suggest that Iran has sought Chinese HQ-9 air-defense systems and J-10C fighter aircraft, although Beijing has denied some reported transfers. Institutional cooperation is more established, with Iran joining the Shanghai Cooperation Organisation in 2023 and BRICS in 2024.
For India, maintaining its relationship with Iran is crucial due to Tehran's importance in New Delhi's connectivity strategy towards Afghanistan, Central Asia, and the wider Eurasian region. The Chabahar Port is central to this strategy, providing an alternative route that bypasses Pakistan. However, China's growing role in Iranian infrastructure could reduce India's strategic space.