Japan has officially begun preparations to release its strategic oil reserves, a significant step in response to a deepening energy crisis.
This move directly addresses the 'effective closure' of the Strait of Hormuz, a critical chokepoint for global energy supplies. The situation presents a severe logistics and availability crisis, not just a price shock. With roughly 95% of its crude oil coming from the Middle East and 70% of that volume normally transiting the strait, Japan’s economic lifeline is under direct threat.
The crisis escalated through a clear sequence of events. First, the primary trigger was the U.S.–Israel strikes on Iran in late February 2026, which prompted Iran's Revolutionary Guard to halt tanker traffic, effectively shutting down the corridor.
Second, the economic consequences were immediate and severe. Maritime insurers canceled war-risk coverage, and shipping rates for Very Large Crude Carriers (VLCCs) skyrocketed. This created a de facto blockade, making it prohibitively expensive for tankers to transit the area and strangling the physical flow of oil to Asia.
Third, this intense pressure forced a swift policy reaction in Japan. On March 5, Japanese refiners formally requested the government tap the reserves. This was followed by signals from Tokyo that a release was under consideration on March 6. By March 8, the Agency for Natural Resources and Energy (ANRE) issued the formal directive to the Shibushi national oil base to prepare for a release.
Fortunately, Japan is well-positioned to handle the initial shock. The nation holds a substantial buffer, with total government and private reserves covering about 254 days of consumption. This large stockpile allows for a calm, calculated response rather than a panicked one. However, the order to prepare marks a crucial shift from simply monitoring the situation to actively managing a potential long-term supply disruption.
- Strait of Hormuz: A narrow waterway between Iran and Oman, through which a significant portion of the world's oil supply passes.
- Strategic Petroleum Reserve (SPR): A stockpile of crude oil maintained by a country to safeguard against major supply disruptions.
- VLCC (Very Large Crude Carrier): The largest class of oil tanker, used for long-haul crude transport.