Expert Explains | Historical arc of Iran-India ties, their significance in a changing West Asia

The 2026 US-Israel military conflict with Iran has placed India's strategic interests in a direct dilemma: New Delhi's significant connectivity and energy in...

What Happened

The 2026 US-Israel military conflict with Iran has placed India's strategic interests in a direct dilemma: New Delhi's significant connectivity and energy investments in Iran are at risk from both the conflict and the reimposition of US sanctions.
The US revoked all exemptions to Iran-related sanctions in late 2025 (second Trump administration), including the Chabahar port waiver, which was extended for India until April 26, 2026 — after which it expired without renewal.
India's Union Budget 2026 allocated zero funds for the Chabahar port project, signalling a pause in formal governmental investment even as operational management continued.
New Delhi responded to the US-Israel military strikes on Iran with restrained calls for de-escalation and diplomacy, deliberately avoiding direct condemnation or naming of the parties responsible — a posture framed as "strategic autonomy."
By April 2026, India was exploring a temporary transfer of its stake in the Chabahar Free Zone entity to an Iranian partner as a "tactical recalibration" — preserving the relationship without directly violating US sanctions.

Static Topic Bridges

Chabahar Port and India's Connectivity Strategy

Chabahar is a deep-water port located on Iran's southeastern coastline on the Gulf of Oman — outside the Strait of Hormuz and therefore not directly affected by Hormuz closures. It is India's primary strategic asset in the connectivity architecture linking South Asia to Central Asia, Afghanistan, and Eurasia without routing through Pakistan.

India has invested approximately $500 million in Chabahar's Shahid Beheshti terminal, with the India Ports Global Limited (IPGL) operating the terminal under a 10-year agreement signed in May 2024.
Chabahar provides India direct access to Afghanistan, bypassing Pakistan entirely — reducing the distance from Mumbai to Kabul by approximately 7,000 km compared to the Pakistan overland route.
The port connects to the Zaranj-Delaram highway (built by India's BRO at a cost of $150 million), which links Afghanistan's western border to the Iranian road network.
Chabahar's strategic importance increased after Pakistan denied India overland transit to Afghanistan following the 2016 suspension of bilateral trade.
In 2024, over 90 vessels and approximately 1.2 million tonnes of cargo passed through the Shahid Beheshti terminal under Indian management.

Connection to this news: The expiry of the US sanctions waiver on Chabahar in April 2026 and the outbreak of direct US-Iran conflict creates existential uncertainty for India's decade-long investment. The "tactical recalibration" reflects India's attempt to preserve the infrastructure relationship without triggering secondary US sanctions.

International North-South Transport Corridor (INSTC)

The INSTC is a 7,200-km multi-modal transport network — combining sea, rail, and road links — designed to connect India to Russia and Central Asia through Iran. It is the most direct route for Indian goods to reach Eurasian markets and reduces both transit time and logistics costs significantly compared to the Suez Canal route.

INSTC was agreed upon in September 2000 by India, Iran, and Russia in St. Petersburg; subsequently expanded to 13 member states.
The corridor links Mumbai → Nhava Sheva (sea) → Bandar Abbas / Chabahar (Iran) → Iranian rail/road → Azerbaijan/Caspian crossing → Russia (Astrakhan, Moscow).
INSTC is estimated to reduce transit time between Mumbai and Moscow by approximately 40% (from ~40 days via Suez to ~25 days via INSTC) and cut logistics costs by approximately 30%.
The Rasht-Astara rail link (the missing segment of the INSTC's western branch through Azerbaijan) was under construction as of 2025; its completion would unlock the full corridor's potential.
India's total trade with Russia via INSTC grew significantly after 2022 (Russia-Ukraine conflict) when alternative routes became commercially attractive.

Connection to this news: The 2026 Iran crisis directly threatens the INSTC's Iranian segment — the entire corridor's viability depends on stable operations in Iran. If Chabahar becomes operationally inaccessible due to conflict or sanctions, India loses its primary physical alternative to the Suez Canal-Pakistan route for Eurasian trade.

India-Iran Energy Relationship and Sanctions History

Iran was historically one of India's top crude oil suppliers before US sanctions systematically reduced this relationship to near-zero. The history of this energy tie illustrates how India navigates the tension between strategic autonomy and economic dependence on the US financial system.

Before November 2018, Iran was India's fourth-largest crude oil supplier, delivering approximately 23.5 million tonnes annually.
Following the US reimposition of sanctions and ending of India's waiver in 2019, India's oil imports from Iran collapsed by approximately 99% within a year.
Bilateral India-Iran trade fell from approximately $17 billion in 2018 to approximately $1.68 billion by 2025.
India's imports from Iran in 2024 were approximately $1.06 billion — a fraction of the pre-sanction relationship.
India paid for some Iranian oil imports in rupees through the UCO Bank mechanism before US pressure effectively shut this channel down.
India is the world's third-largest oil importer; Gulf states (Saudi Arabia, UAE, Iraq, Kuwait) collectively supply approximately 55–60% of India's crude oil needs.

Connection to this news: The 2026 crisis has revived discussions about India potentially resuming Iranian oil imports (Iran announced willingness to accept payments in any currency), but with active US-Iran military conflict and no sanctions waiver, this remains diplomatically and legally complex.

India's Strategic Autonomy Doctrine in West Asia

India's foreign policy framework for West Asia is built on what New Delhi describes as "strategic autonomy" — maintaining equidistant, transaction-based relationships with multiple competing powers (Iran, Arab Gulf states, Israel, the US) simultaneously, rather than formally aligning with any bloc.

India has significant economic and strategic relationships simultaneously with Iran (Chabahar, INSTC, oil), Arab Gulf states (diaspora remittances of ~$35 billion/year, oil imports, investment), Israel (defence technology, agriculture, cybersecurity), and the US (QUAD, defence, technology).
India abstained or used carefully worded neutral positions at the UN on multiple West Asia resolutions to avoid alienating any of these partners.
The "strategic autonomy" framework explicitly rejects formal alliance commitments, instead pursuing issue-based coalitions — a doctrine traceable to Nehruvian non-alignment but adapted for a multipolar world.
India's West Asia policy is also shaped by approximately 9 million Indian workers in Gulf countries, whose remittances (~$35–40 billion/year) represent a critical macroeconomic input.

Connection to this news: The 2026 crisis is the most severe test of India's strategic autonomy framework in the region: India must balance its Chabahar/INSTC/Iran energy interests against its relationship with the US (a QUAD partner and defence technology supplier), Arab Gulf states (oil and remittances), and Israel (defence ties). India's restrained diplomatic response reflected this structural constraint.

India-Iran Diplomatic History

India and Iran established formal diplomatic relations in 1950. The relationship has oscillated across three phases: warm civilisational and economic ties in the pre-1979 period, significant strain after the Islamic Revolution (1979) due to India's secular non-theocratic state model, and a pragmatic reset from the mid-1990s onward driven by shared interests in Afghanistan stability, Pakistan containment, and energy.

1950: Formal diplomatic relations established.
2001: Iran strongly supported India's position in the aftermath of the 9/11 attacks and opposed Taliban rule in Afghanistan — a shared interest that drove a strategic partnership through the early 2000s.
2003: Tehran Declaration — India and Iran declared a "strategic partnership."
2016: India signed a tripartite agreement with Iran and Afghanistan on Chabahar port development — operationalising the connectivity vision.
2024: India Ports Global (IPGL) signed a 10-year agreement to operate the Shahid Beheshti terminal at Chabahar.
India has consistently opposed unilateral (non-UN) sanctions on Iran as a matter of principle, while pragmatically complying with US financial pressure when the cost of non-compliance exceeded tolerance.

Connection to this news: The 2026 crisis tests whether the "strategic partnership" declared in 2003 has any operational content when Iran is directly at war with a US-led coalition. India's response — restrained calls for diplomacy, zero budget allocation for Chabahar, and "tactical recalibration" of equity stakes — suggests the economic and US-relations cost outweighed the strategic autonomy imperative in this phase.

Key Facts & Data

INSTC: signed September 2000 (India, Iran, Russia); 7,200 km multi-modal corridor; 13 member states; reduces Mumbai-Moscow transit time by ~40% and logistics costs by ~30%.
Chabahar: India investment ~$500 million; 10-year operating agreement signed May 2024 (IPGL); located on Gulf of Oman (outside Strait of Hormuz).
Zaranj-Delaram highway: built by India's BRO for ~$150 million; links Afghanistan to Iranian road network via Chabahar corridor.
Iran's pre-sanctions ranking: India's fourth-largest crude oil supplier; ~23.5 million tonnes/year before 2018.
India-Iran bilateral trade: ~$17 billion (2018) → ~$1.68 billion (2025) — a 90%+ collapse after sanctions.
India's imports from Iran (2024): ~$1.06 billion.
India is the world's third-largest oil importer and consumer.
India-Iran formal diplomatic relations: established 1950; Tehran Declaration (strategic partnership): 2003.
Chabahar-Afghanistan corridor reduces Mumbai-Kabul distance by ~7,000 km compared to Pakistan overland route.
Indian diaspora in Gulf countries: ~9 million workers; annual remittances ~$35–40 billion.
US Chabahar sanctions waiver for India: expired April 26, 2026; Union Budget 2026 allocated zero funds for the project.