How dependent is Japan on Middle East oil?: Japan imports over 90 per cent of its energy and roughly 80 per cent of its crude transits the Strait of Hormuz, making it uniquely exposed to any Gulf disruption.
Is Japan a target of the US naval blockade of Iran?: Mitsui OSK Sohar LNG paid Iran's Hormuz toll, and Trump's 13 April interdiction order named the vessel as a target. Japan has not joined the US blockade, and Chief Cabinet Secretary Kihara said Japan is still weighing its minesweeper deployment options.Source: iran-conflict-2026
What is Japan doing about the Iran conflict energy crisis?: Tokyo has activated strategic petroleum reserves, dispatched diplomatic envoys to Gulf States and Washington, and is considering contributing minesweepers to the UK-led 40-nation Hormuz Coalition.
Can Japan take military action over the Strait of Hormuz?: No. Article 9 of Japan's constitution prohibits offensive war potential. Japan relies on the US-Japan Security Treaty for any hard military response, and is debating whether minesweeper deployment is constitutional.
How does Japan compare to other countries exposed to the Iran conflict?: Japan and South Korea are the most exposed major economies: both import almost all their energy via Hormuz, unlike the US, which is a net oil exporter.
Why is Japan so vulnerable to the Strait of Hormuz crisis?: Japan imports over 90% of its energy and routes roughly 80% of its crude oil through the Strait of Hormuz. It has no significant domestic oil reserves and cannot substitute Gulf LNG and crude at scale without years of infrastructure build-out.
Is Japan's Sayonara Tax increasing in 2026?: Yes. Japan's departure tax doubles to ¥3,000 from July 2026. The Japan Rail Pass also rises by ¥3,000 to ¥7,000 from October 2026.
Did Japan break its arms export ban in 2026?: Yes. Japan authorised direct exports of PAC-3 Patriot interceptor missiles to the United States in April 2026 to replenish stocks depleted by the Iran war, breaking Japan's post-World War Two arms export restrictions.
What does Japan's postwar constitution say about its military?: Article 9 of Japan's constitution prohibits the maintenance of war potential. Japan relies on the US-Japan Security Treaty, in force since 1952, for hard military deterrence.
Which Japanese cities now charge an accommodation tax?: From April 2026, Hokkaido, Sapporo, Hiroshima, Yugawara, Gifu, Toba, and fifteen Hokkaido municipalities activated per-night accommodation taxes of ¥100 to ¥500. Nagano, Kumamoto City and Miyazaki City were approved for June 2026.

Background

Japan faces its most severe energy security test in decades as the Iran conflict threatens the Strait of Hormuz, through which roughly 80 per cent of its crude oil imports transit. Tokyo imports over 90 per cent of its energy needs and has no significant domestic oil reserves. The disruption has pushed Japanese refiners to seek alternative suppliers at steep premiums, while the government has activated strategic petroleum reserve protocols and dispatched diplomatic envoys to Gulf States and Washington to press for de-escalation.

Japan is the world's fourth-largest economy (GDP approximately $4.2 trillion) and home to 125 million people. Its postwar constitution, Article 9, prohibits the maintenance of war potential, leaving Japan dependent on the US-Japan Security Treaty (in force since 1952) for hard military deterrence. Prime Minister Shigeru Ishiba has navigated calls from hawkish allies to take a stronger stance while keeping Japan within its constitutional limits. In April 2026, Japan authorised direct exports of PAC-3 Patriot interceptor missiles to the United States to replenish stocks depleted by the Iran war, breaking Japan's post-war arms export restrictions in a significant constitutional shift.

The Mitsui OSK Sohar LNG transit placed Japan in an acutely uncomfortable position: the vessel paid Iran's Hormuz toll to secure a cargo Japan desperately needs, and Trump's interdiction order subsequently named it as a target. Japan thus faces dual exposure as a toll-payer vulnerable to US interdiction and as a major economy whose energy lifeline depends on a strait its closest ally is now blockading.

In tourism and travel policy, Japan has tightened visitor cost structures across 2026. The Sayonara Tax (departure levy) doubles to ¥3,000 from July 2026; the Japan Rail Pass rises by ¥3,000 to ¥7,000 from October 2026. A wave of local accommodation taxes broadened from April 2026, with Hokkaido, Sapporo, Hiroshima, and eight further municipalities activating per-night levies of ¥100 to ¥500, stacked independently by prefecture and city.

How the World Sees Them

Iran

Tehran has not targeted Japanese interests directly but uses Hormuz closure as leverage. Japan's neutrality gives Iran a useful diplomatic back-channel.

China

Beijing shares Japan's Hormuz dependency and has avoided condemning Iran publicly. It watches Tokyo's moves for any shift towards remilitarisation.

South Korea

Seoul faces identical energy exposure and has coordinated with Tokyo on reserve releases. Joint pressure on Washington for a naval escort programme is ongoing.

United States

Washington values Japan as its primary Pacific ally and is under pressure to keep Hormuz open. A supply shock to Tokyo weakens US alliance credibility across Asia.