# Strait of Hormuz Crude Flows Nearly Tripled During 60-Day US-Iran MoU vs Blockaded Period

*Kpler data shows 374 million barrels of crude cleared the Gulf during MoU window, averaging 6.1 mbd against 2.3 mbd pre-MoU blockade rate*

**International Relations · 22 Aug 2026 · GS: GS2, GS3, Essay · Exam yield: Medium**

## Why this matters

Strait of Hormuz is the world's most critical energy chokepoint, and its disruption directly impacts India's energy security, inflation, and external trade balances. For UPSC, this tests your grasp of West Asian geopolitics, global energy architecture, and India's strategic options in a multipolar world.

## In plain words

Imagine a narrow mountain pass that every oil tanker from the Persian Gulf must cross to reach the world. That pass is the Strait of Hormuz. In February 2026, war closed this pass, trapping oil inside. A temporary truce, called the Islamabad MoU, opened it partially for 60 days starting June 17.

During this window, ship-tracking data shows about 374 million barrels of crude exited the Gulf, averaging 6.1 million barrels per day. This was nearly triple the rate during the blockade, but still only 40% of the normal flow before the war. The deal collapsed by August 17 because key promises—like lifting the blockade fully and clearing underwater mines—were never kept. Iran now claims the right to charge tolls, which the US rejects.

Think of it like a jammed pipeline: the MoU loosened the clog temporarily, letting some oil through, but the pipe is still damaged and the pressure is building again. The backlog of ships is clearing slowly, but the system remains broken.

## Key facts

- 374 million barrels of crude exited the Gulf during 60-day MoU, ~6.1 million barrels per day (mbd) average
- Flow rate nearly triple the 2.3 mbd average during April-June blockaded period
- Remains 60% below 2025 pre-war Hormuz average of ~15 mbd
- Brent crude traded at $91.93/barrel on August 20, 2026

## How we got here

The crisis began on February 28, 2026, when the US-Israel war on Iran led to the closure of the Strait of Hormuz. Iran blocked the waterway in early March, allowing only 'friendly' ships. This stranded roughly one-fifth of global seaborne oil. Diplomatic efforts, primarily facilitated by Pakistan, resulted in the 'Islamabad MoU' signed on June 17, 2026. This 60-day agreement aimed to restore safe passage and included US commitments to lift a naval blockade and issue oil waivers. However, the truce unraveled mid-July following attacks on vessels like the AL REKAYYAT and WEDYAN, leading to the revocation of US waivers and reimposition of blockades. The window lapsed on August 17 without an extension, leaving Iran asserting a permit regime and the US rejecting it.

## The bigger picture

**International — Geopolitics of the Persian Gulf**

The expiration of the MoU highlights the fragility of diplomacy in West Asia. Iran's assertion of a 'permit-and-toll regime' challenges the international principle of 'free passage' in straits used for international navigation under UNCLOS. The US rejection of this regime sets the stage for a naval standoff. The role of Pakistan as a facilitator and Oman as a potential alternative route partner shows the regional realignment triggered by the crisis.

→ Conflict between sovereignty claims and freedom of navigation defines the Hormuz standoff.

**Economic — Global Energy Security and Oil Markets**

The Strait handles about one-fifth of global oil supply. The MoU period saw flows at 6.1 mbd, far below the ~15 mbd pre-war average of 2025 [aljazeera.com](https://www.aljazeera.com/economy/2026/8/20/oil-flows-nearly-tripled-before-us-iran-mou-expired). Despite the partial flow, Brent crude remained high at $91.93/barrel in August 2026. The backlog of 520 commercial vessels inside the Gulf threatens a supply crunch in Q4 2026 as inventory buffers thin.

→ Partial reopening failed to stabilize prices or clear the massive vessel backlog.

**Political — Diplomatic Failure and Regional Stability**

The Islamabad MoU failed because operative commitments collapsed early; the US oil waiver lasted only 20 days and the blockade lift 27 days [kpler.com](https://www.kpler.com/blog/60-days-of-a-broken-us-iran-mou-the-market-stopped-waiting-for-hormuz). Iran's mine-clearance obligation was never completed. This political breakdown has shifted the conflict zone, with Houthis declaring a maritime embargo on Saudi ports, indicating a spillover effect across the Red Sea and Arabian Sea.

→ Short-lived diplomatic windows fail without verifiable compliance on security guarantees.

**Science & Tech — Maritime Surveillance and Dark Shipping**

Kpler data reveals that over half of all crossings since the war began were 'dark' (no reliable tracking signal), and 29% used Iranian-controlled routes [thenationalnews.com](https://www.thenationalnews.com/business/energy/2026/08/17/hormuz-traffic-falls-to-single-digits-as-60-day-deadline-for-us-iran-mou-expires). This reliance on dark fleet tactics complicates monitoring by international agencies. The physical constraint now is mine clearance and war-risk insurance, not just naval presence, requiring specialized demining technology.

→ Dark fleet operations and mine warfare have replaced open naval battles as the primary barriers.

## The big debate

**Should international law permit a coastal state to impose tolls or permits on transits through a strategic strait during wartime?**

**For**
- Coastal states bear the security burden and environmental risk of tanker traffic, justifying temporary regulatory control.
- A permit regime can ensure ships are not carrying contraband or military supplies to adversaries during conflict.

**Against**
- UNCLOS guarantees non-suspendable transit passage in straits; tolls violate the principle of freedom of navigation.
- Weaponizing chokepoints creates global economic instability and sets a dangerous precedent for other regions like Malacca.

**The balanced take:** While coastal states have security concerns, international law under UNCLOS prioritizes uninterrupted transit to prevent economic coercion. The solution lies in multilateral guarantees for safe passage rather than unilateral toll regimes that destabilize global trade.

## Answer it in Mains

**Discuss the strategic significance of the Strait of Hormuz for India's energy security and the geopolitical challenges in the Persian Gulf region.** *(GS2)*

How to attack it: Introduce Hormuz as a critical chokepoint. Discuss the impact of the 2026 closure on India's imports. Analyze the failure of the Islamabad MoU. Conclude with India's need for diversified routes and proactive diplomacy.

Quote this: Kpler data showing 6.1 mbd flow vs 15 mbd pre-war average [kpler.com](https://www.kpler.com/blog/60-days-of-a-broken-us-iran-mou-the-market-stopped-waiting-for-hormuz).

**How does the concept of 'Freedom of Navigation' apply to international straits? Examine the recent tensions in the Strait of Hormuz in this context.** *(GS3)*

How to attack it: Define Freedom of Navigation under UNCLOS. Contrast Iran's permit-toll regime with international norms. Use the 2026 MoU failure to highlight the economic costs of restricting transit. Suggest multilateral monitoring.

Quote this: Reference to UNCLOS Part III on transit passage regimes and the 520 vessels stuck in the Gulf [thenationalnews.com](https://www.thenationalnews.com/business/energy/2026/08/17/hormuz-traffic-falls-to-single-digits-as-60-day-deadline-for-us-iran-mou-expires).

**The closure of the Strait of Hormuz is not just an energy crisis but a test for global supply chain resilience. Critically analyze.** *(GS3)*

How to attack it: Link the strait's closure to global inflation and LNG shortages. Discuss the 'dark fleet' phenomenon and war-risk insurance spikes. Evaluate the Q4 2026 shortfall of 550 mb. Propose strategic reserves and alternative corridors.

Quote this: Kpler estimate of 550 mb shortfall in Q4 2026 bridged by inventory draws [kpler.com](https://www.kpler.com/blog/60-days-of-a-broken-us-iran-mou-the-market-stopped-waiting-for-hormuz).

## Prelims quick-fire

- **[Geography]** Strait of Hormuz connects the Persian Gulf to the Gulf of Oman and is 21 nautical miles wide at its narrowest [aljazeera.com](https://www.aljazeera.com/news/2026/8/20/are-hormuz-ships-more-willing-to-defy-iran-or-the-us-what-data-shows). — *Approximately one-fifth of global oil and LNG supply transits here pre-war.*
- **[Data]** Kpler data shows 374 million barrels of crude cleared the Gulf during the 60-day MoU window (June 17–Aug 17, 2026) [aljazeera.com](https://www.aljazeera.com/economy/2026/8/20/oil-flows-nearly-tripled-before-us-iran-mou-expired). — *This equals ~6.1 million barrels per day, nearly triple the blockaded rate.*
- **[Data]** Pre-war (2025) average flow through Hormuz was ~15 million barrels per day; current flows are ~40% of this [kpler.com](https://www.kpler.com/blog/60-days-of-a-broken-us-iran-mou-the-market-stopped-waiting-for-hormuz). — *The 2025 baseline is the standard reference for 'normal' flow capacity.*
- **[International]** The Islamabad MoU was signed on June 17, 2026, following diplomacy primarily facilitated by Pakistan [aljazeera.com](https://www.aljazeera.com/economy/2026/8/20/oil-flows-nearly-tripled-before-us-iran-mou-expired). — *Pakistan acted as the key interlocutor between Washington and Tehran.*
- **[Data]** Iranian crude exports collapsed from 893,000 bpd in July to 156,000 bpd through August 17, 2026 [kpler.com](https://www.kpler.com/blog/60-days-of-a-broken-us-iran-mou-the-market-stopped-waiting-for-hormuz). — *Iran's exports fared worse than other Gulf producers post-MoU.*
- **[Data]** Approximately 520 commercial vessels are stuck in the Arabian Gulf as of mid-August 2026 [thenationalnews.com](https://www.thenationalnews.com/business/energy/2026/08/17/hormuz-traffic-falls-to-single-digits-as-60-day-deadline-for-us-iran-mou-expires). — *Clearing this backlog is estimated to take 6-8 weeks even if mines are removed.*
- **[Data]** Brent crude traded at $91.93 per barrel on August 20, 2026, reflecting market tension despite the MoU [Seed Data]. — *Price remained high due to uncertainty over the strait's long-term status.*

## What should happen

1. **Multilateral Naval Escort Mechanism** A coalition of consumer nations can provide insurance and security to ensure continuous flow.
2. **Accelerated Demining Operations** Physical clearance of mines is the primary technical barrier to restoring 15 mbd flow.
3. **Diversification of Energy Corridors** India must expedite the India-Middle East-Europe Corridor (IMEC) to reduce Hormuz dependency. *(India-Middle East-Europe Corridor (IMEC))*
4. **Strategic Petroleum Reserve (SPR) Release** Consumer nations should coordinate SPR releases to bridge the 550 mb shortfall expected in Q4 2026. *(International Energy Agency (IEA))*

## Jargon, demystified

- **Strait of Hormuz** — A narrow waterway between Oman and Iran connecting the Persian Gulf to the Gulf of Oman and Arabian Sea; a critical oil chokepoint. *(Carries ~20% of global oil; map-based questions common.)*
- **Memorandum of Understanding (MoU)** — A formal agreement between two or more parties outlining intentions and actions, often non-binding but politically significant. *(The 'Islamabad MoU' of June 2026 was a 60-day truce attempt.)*
- **Barrels per day (bpd/mbd)** — A unit of measurement for oil production or consumption, representing the volume of crude oil moved in 24 hours. *(1 mbd = 1 million barrels per day; standard unit for flow rates.)*
- **UNCLOS (United Nations Convention on the Law of the Sea)** — An international treaty defining maritime zones, navigation rights, and the legal framework for sea resource use. *(Governs 'Transit Passage' in straits like Hormuz; India is a signatory.)*
- **Dark Shipping** — The practice of turning off a ship's Automatic Identification System (AIS) tracker to hide its location and activities. *(Over 50% of Hormuz transits post-war were 'dark' [thenationalnews.com](https://www.thenationalnews.com/business/energy/2026/08/17/hormuz-traffic-falls-to-single-digits-as-60-day-deadline-for-us-iran-mou-expires).)*
- **Brent Crude** — A major trading classification of crude oil used as a benchmark price for global oil markets, sourced from the North Sea. *(Price stood at $91.93/barrel on Aug 20, 2026, indicating market stress.)*

## Revise in 30 seconds

- MoU (June 17–Aug 17, 2026) tripled flow to 6.1 mbd but remained 60% below 2025 levels.
- Iran now claims a permit-and-toll regime; US rejects it, leading to a standoff.
- 520 vessels are stuck; clearing the backlog will take 6-8 weeks per Kpler.
- Brent crude at $91.93/barrel shows markets remain nervous despite partial flows.
- Q4 2026 faces a 550 mb shortfall as inventory buffers thin out.

## Study next

**Static links:** Indian Constitution: International Borders and Treaties, Geography: Straits and Chokepoints, Economy: Energy Security

**Essay angle:** Chokepoints of the 21st Century: Navigating the Narrow Waters of Global Energy Security.

**Interview probe:** With Hormuz flow at 40% of normal, how should India balance its energy imports and strategic autonomy in West Asia?

## Sources

- [Oil flows nearly tripled before US-Iran MoU expired, analysis shows](https://www.aljazeera.com/economy/2026/8/20/oil-flows-nearly-tripled-before-us-iran-mou-expired)

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