Japan holds off naval deployment to Hormuz Strait

May 1 (Asia Today) -- Japan considered deploying its Self-Defense Forces to the Strait of Hormuz ahead of a summit with U.S. President Donald Trump but ultimately held back due to constitutional and legal constraints, reports said Friday.

Prime Minister Sanae Takaichi reviewed options in March to send naval assets to the region amid heightened tensions in the Middle East, according to Japanese media.

Two proposals were examined: dispatching minesweepers under Japan's Self-Defense Forces law or sending destroyers and patrol aircraft for "survey and research" purposes under a separate legal framework. Both options were shelved due to concerns they could violate Japan's pacifist constitution.

Article 9 of Japan's constitution renounces war and prohibits the use of force to settle international disputes, placing strict limits on overseas military operations.

The discussions were prompted in part by U.S. requests for allied support in securing maritime routes. Trump warned in March that Iran could disrupt shipping in the Strait of Hormuz using drones, mines and short-range missiles, and called on countries including Japan, South Korea and European allies to contribute naval forces.

The Strait of Hormuz is a critical energy corridor for Japan, which depends heavily on Middle Eastern oil imports. Any prolonged disruption could affect supplies of crude oil, naphtha and petrochemical products.

Japanese officials acknowledged the urgency of ensuring maritime security but stressed legal limits. Defense Minister Shinjiro Koizumi said Japan must act within the bounds of its laws, while Takaichi told parliament she had explained constitutional constraints during talks with Trump.

Legal concerns centered on whether minesweeping operations in a conflict zone could be considered part of combat activities, potentially violating Article 9. Similarly, deploying naval vessels under the guise of research could be viewed as de facto joint operations with U.S. forces in a high-risk area.

Despite the decision, debate continues within Japan. Lawmakers from the ruling Liberal Democratic Party have suggested revisiting deployment options if maritime disruptions persist, emphasizing the importance of securing sea lanes.

The episode highlights Japan's evolving security posture. While Tokyo has expanded defense spending and strengthened alliances, its ability to deploy forces abroad remains constrained by constitutional interpretation.

The issue also carries implications for South Korea, which relies on the same energy routes. If the United States increases pressure on allies to contribute to maritime security, both Seoul and Tokyo may face similar dilemmas balancing energy security with military involvement.

-- Reported by Asia Today; translated by UPI

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Original Korean report: https://www.asiatoday.co.kr/kn/view.php?key=20260501010000010

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This story was originally published May 1, 2026 at 5:45 PM.