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Japan Says Dispatching Ships to Middle East Faces High Hurdles

March 15, 2026 5 min read International Relations GS Paper 2
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What Happened

  • President Trump publicly urged Japan, along with China, France, South Korea, and the UK, to send warships to help keep the Strait of Hormuz open following Iran's effective closure of the waterway during the ongoing US-Israel-Iran war.
  • A senior Japanese official responded that dispatching Japanese military vessels to the Middle East would face "high hurdles," noting it was "not legally ruled out, given the ongoing conflict, but should be judged carefully."
  • Japan's foreign ministry stated that Japan "decides its own response, and independent judgment is fundamental."
  • The Strait of Hormuz carries approximately 70% of Japan's crude oil imports — making Japan one of the most economically exposed countries to the waterway's closure.
  • Japan's cautious response is rooted in Article 9 of its postwar Constitution, which renounces war and restricts the use of force by the Japan Self-Defense Forces (JSDF).
  • Japan's Prime Minister faces a political bind: open defiance of Trump could damage the US-Japan security alliance; but deploying ships could trigger domestic constitutional and political opposition.

Static Topic Bridges

Article 9 of the Japanese Constitution: Pacifism and Its Reinterpretations

Article 9 of Japan's Constitution — adopted in 1947 under US Occupation direction (often called the "MacArthur Constitution") — contains two paragraphs. Paragraph 1 renounces war as a sovereign right and the threat or use of force to settle international disputes. Paragraph 2 states that "war potential" will never be maintained. Despite this, Japan established the Japan Self-Defense Forces (JSDF) in 1954, justified by successive governments as maintaining the minimum necessary for self-defense. A landmark reinterpretation came in July 2014 when Prime Minister Shinzo Abe's cabinet reinterpreted Article 9 to allow "collective self-defense" — permitting Japan to use force in defense of allied nations under attack, even if Japan itself is not attacked. This was codified in the 2015 Peace and Security legislation. Japan's defense posture has further evolved with the 2022 National Security Strategy, which approved "counterstrike capabilities" for the first time.

  • Article 9 adopted: 1947 (postwar constitution)
  • Japan Self-Defense Forces (JSDF): established 1954
  • Abe's 2014 cabinet reinterpretation: allowed collective self-defense
  • 2015 Peace and Security Laws: codified collective self-defense legislation
  • 2022 National Security Strategy: approved "counterstrike capabilities" (preemptive strike against missile launch sites)
  • Japan's defense budget: Abe-era pledge to reach 2% of GDP by 2027 (from ~1%)
  • JSDF overseas dispatch: requires cabinet decision and (for combat) parliamentary approval
  • Japan-US Security Treaty (1960): requires US to defend Japan; Japan provides bases

Connection to this news: Japan's "high hurdles" framing reflects the constitutional and political reality that deploying JSDF vessels into an active combat zone (the Strait of Hormuz during the Iran-US war) would push well beyond the existing legal boundaries of collective self-defense.

Strait of Hormuz: Strategic Chokepoint and Global Energy Security

The Strait of Hormuz is a narrow waterway between Iran and Oman connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea. At its narrowest, it is approximately 33 km wide, with two-mile-wide shipping lanes in each direction. It is the world's most critical oil chokepoint: approximately 20 million barrels per day (b/d) of oil — around 20% of global petroleum liquids consumption — transited through the strait in 2024. Japan receives approximately 10.9% of total Hormuz oil flows, making it the fourth-largest destination after China (37.7%), India (14.7%), and South Korea (12.0%). The strait also carries approximately 20% of global LNG trade, primarily Qatari LNG. Iran has repeatedly threatened to close the Strait of Hormuz in response to US-led sanctions, but has never done so completely; the current Iran-US war context represents the most acute threat to Hormuz navigation in decades.

  • Location: Between Iran (north) and Oman (south); connects Persian Gulf to Gulf of Oman
  • Width at narrowest point: ~33 km; shipping lanes ~2 miles wide in each direction
  • Oil transit (2024): ~20 million b/d — ~20% of global petroleum liquids
  • LNG transit: ~20% of global LNG trade
  • Top destinations by share: China (37.7%), India (14.7%), South Korea (12.0%), Japan (10.9%)
  • Top exporter through Hormuz: Saudi Arabia — 38% of Hormuz crude flows (5.5 mb/d)
  • Qatar's LNG: ~93% of Qatar's LNG exports transit Hormuz
  • Iran's threat: Repeated threats to close strait; never fully executed prior to 2026

Connection to this news: Japan's 70% oil import dependence on Hormuz gives it enormous economic incentive to participate in Hormuz security — but Article 9 constraints and the risk of being drawn into an active war create a direct tension at the heart of Japanese foreign and security policy.

US-Japan Security Alliance (Treaty of Mutual Cooperation and Security)

The Treaty of Mutual Cooperation and Security between the US and Japan was signed in 1960, replacing the original 1951 security treaty. Under Article 5, both parties commit to act in case of armed attack on territories under Japan's administration. Under Article 6, Japan allows the US to use Japanese facilities and areas for defense of Japan and maintenance of peace and security in the Far East. Japan hosts approximately 55,000 US military personnel across installations including Yokosuka Naval Base, Okinawa, and Misawa Air Base. The US-Japan alliance is described as the "cornerstone of regional security in Asia." Trump's first-term pressure on Japan to increase burden-sharing has continued in his second term, with demands including higher Host Nation Support payments and active contribution to security beyond Japan's immediate vicinity.

  • US-Japan Security Treaty: originally 1951; revised 1960 (Treaty of Mutual Cooperation and Security)
  • Article 5: Mutual defense of territories under Japan's administration
  • Article 6: Japan provides bases for US use for regional security
  • US troops in Japan: ~55,000 (as of recent figures)
  • Key US bases: Yokosuka (naval HQ), Kadena Air Base (Okinawa), Misawa Air Base
  • Host Nation Support: Japan contributes billions annually to US base costs in Japan
  • Current PM of Japan: Sanae Takaichi (as of context; check for updates)

Connection to this news: Japan faces a classic alliance dilemma: refusing Trump's Hormuz request risks straining the US-Japan security treaty relationship, on which Japan depends for its own defense against China and North Korea. But complying risks constitutional violations and domestic political backlash.

Key Facts & Data

  • Japan's crude oil dependence on Strait of Hormuz: ~70%
  • Japan's share of total Hormuz oil flows: 10.9% (4th largest destination)
  • Strait of Hormuz oil transit: ~20 million b/d (~20% of global petroleum consumption)
  • LNG through Hormuz: ~20% of global LNG trade
  • Article 9 (Japan Constitution): adopted 1947; renounces war and war potential
  • JSDF established: 1954
  • Abe 2014 reinterpretation: allowed collective self-defense
  • 2015 Peace and Security Laws: codified collective self-defense
  • 2022 National Security Strategy: approved counterstrike capabilities
  • US-Japan Security Treaty: signed 1960
  • US troops in Japan: ~55,000