Full Breakdown
Japan’s First Crude-Laden VLCC Crosses Hormuz Since the U.S.–Israel War
4/30/2026, 7:09:37 AM
Core Event: Idemitsu Maru Clears Hormuz
The Panama-flagged VLCC Idemitsu Maru, operated by a unit of Japanese refiner Idemitsu Kosan, completed a transit of the Strait of Hormuz on 28 April 2026. Carrying ? 2 million barrels of Saudi crude bound for Nagoya, the vessel followed a Tehran-approved northern lane near Qeshm and Larak islands and entered the Gulf of Oman later that day.
Background & Context
On 28 February 2026 the United States and Israel launched attacks on Iran, prompting Tehran to close the Hormuz chokepoint. Prior to the conflict, ? 125–140 ships crossed daily; in the 24 hours before Idemitsu Maru’s passage only seven vessels were recorded. Japan imports ? 95 % of its oil from the Middle East, most of it via Hormuz, and has relied on ship-to-ship transfers and smaller U.S.-laden tankers since the closure.
Timeline
- Early March – 2 MMbbl of crude loaded at Saudi Arabia’s Juaymah terminal.
- Late February – Vessel entered the Persian Gulf before the U.S.–Israel strike.
- 27 April – After a week-long idle period off Abu Dhabi, the ship departed westward.
- 28 April – Crossed Hormuz on the Tehran-approved route; AIS remained active.
- Mid-May (? 18 May) – Expected arrival at Nagoya.
Key Figures & Groups
- Idemitsu Kosan Co. – Owner/operator, declined comment on the specific voyage.
- Prime Minister Sanae Takaichi – Led diplomatic outreach to Iran.
- Foreign Minister Toshimitsu Motegi – Engaged Tehran in early-March talks.
- Iranian Revolutionary Guard Corps (IRGC) – Granted passage without a toll.
- U.S. President Donald Trump – Expressed dissatisfaction with Iran’s peace proposal and warned of a prolonged blockade.
- U.S. Central Command – Enforces a naval blockade extending beyond the declared zone.
Data & Statistics
- Cargo: 2 million barrels of Saudi crude.
- Japan’s oil dependence: ? 95 % from West Asia.
- Pre-war traffic: 125–140 ships/day; post-war (24 h): 7 ships.
- Stalled Japanese fleet: ? 40–41 vessels remain in the Gulf.
- Expected transit time to Japan: ? 20 days.
Official Statements & Responses
Idemitsu Kosan said it would not comment on individual vessels for safety reasons. Japan’s Foreign Ministry called the passage “a positive development for the protection of Japanese nationals.” Tehran’s state media confirmed the transit was authorized and that no toll was paid. The U.S. Treasury warned that any “toll” payments to Iran would violate sanctions, while U.S. Central Command reiterated its authority to interdict vessels suspected of carrying contraband.
Criticism & Opposition
U.S. officials criticized the move as potentially undermining the blockade, noting that “toll” payments are sanctionable. President Trump publicly expressed unhappiness with Iran’s latest peace proposal and signaled readiness for an extended naval blockade.
Conflicting Reports & Gaps
Sources differ on whether a transit fee was paid (some say none, others note uncertainty). Bloomberg data show the ship used a “northern safe route” but did not pass through the Larak Channel, whereas other reports simply describe a “Tehran-approved lane.” AIS activity is reported as active, yet regional tracking acknowledges frequent signal shutdowns. The exact number of Japanese-linked vessels still stranded varies between 40 and 41.
On-the-Ground Reports
Three Japanese crew members were aboard; Japanese officials said their health was not at risk.
Why It Matters / Impact
The transit offers a symbolic breach of the Hormuz closure, suggesting that selective passages are possible and providing a modest relief to Japan’s strained energy supply chain. It also revives historical ties—Idemitsu’s 1953 Nissho Maru episode—while testing the limits of U.S. sanctions enforcement.
What’s Next
Japan continues diplomatic talks with Tehran, aims to release additional strategic oil reserves, and monitors the possibility of further Japanese-linked transits. The United States is expected to maintain its naval blockade pending a negotiated settlement.
Verbatim Quotes
- “Our country has, to date, made representations to Iran on every possible occasion, from the standpoint that it is important to ensure the early restoration of free and safe navigation through the Strait of Hormuz for vessels of all countries, including Japan,” — Sanae Takaichi, Prime Minister of Japan
- “Idemitsu has a long historical relationship with Iran, most notably the 1953 Nissho Maru incident, when Idemitsu transported Iranian crude oil to Japan under intense international pressure.” — Hidenori Watanave, Professor, University of Tokyo
- “The Government of Japan considers this passage of a Japan-related vessel as a positive development, including from the perspective of protection of Japanese Nationals.” — Japanese Foreign Ministry, Official Statement
- “Iran has just informed us that they are in a 'State of Collapse'. They want us to 'Open the Hormuz Strait,' as soon as possible, as they try to figure out their leadership situation (Which I believe they will be able to do!),” — Donald Trump, President of the United States (Truth Social)
- “the tanker that transited Hormuz this time passed through a safe route designated by Iran,” — Senior Japanese government official, reported by Japanese media
