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Japan’s constitutional restraint is Article 9 of its 1947 Constitution, often called the "pacifist constitution," drafted under U.S. occupation after World War II. It states that the Japanese people "forever renounce war as a sovereign right of the nation and the threat or use of force as means of settling international disputes." To achieve this, it declares that "land, sea, and air forces, as well as other war potential, will never be maintained" and that "the right of belligerency of the state will not be recognized." This has long been interpreted to allow the Self-Defense Forces (SDF) only for the "minimum necessary" self-defense of Japan itself—not for offensive operations, collective defense abroad, or combat roles in distant conflicts unless specific narrow conditions are met. Dispatching the SDF to an active combat zone like the Strait of Hormuz (currently disrupted by Iranian actions) for direct military assistance—such as escorting tankers or confronting Iranian forces—would generally be prohibited, as it risks being seen as the "use of force" or exercise of belligerency banned by Article 9. The SDF cannot use weapons or engage in operations against Iran (or any equivalent state/organization) while fighting is ongoing. Prime Minister Sanae Takaichi has explicitly stated that such deployments under the Self-Defense Forces Law are "legally difficult," and Defense Minister Shinjiro Koizumi has noted that protecting vessels is possible in general terms but not in scenarios involving state opponents. Any action risking combat would violate the constitution. Collective self-defense (expanded in 2015): Security legislation under then-Prime Minister Shinzo Abe reinterpreted the constitution to permit limited collective self-defense—but only in a "Situation Threatening Japan's Survival" (STS). This requires that an attack on an ally (e.g., the U.S.) poses a clear existential threat to Japan's security, lives, or rights, with no other options available. A full Iranian blockade of the Hormuz Strait (through which Japan imports the vast majority of its oil) was cited by Abe as a potential STS example for post-conflict minesweeping. However, the current government has not invoked this for the ongoing crisis, citing the high threshold, lack of direct threat to Japan, and political/public opposition. Maritime security/policing operations: These are permitted for law-enforcement-style missions (e.g., protecting Japan-related ships with limited weapon use), but they are designed for scenarios like anti-piracy—not state-on-state conflict. This framework cannot legally extend to combat escorts in the Hormuz Strait against Iran. Other restrictions: Operations must align with Japan's "exclusively defense-oriented" policy. Rear-area support to allies is limited to non-combat scenarios. Any significant deployment requires government review, potential Diet (parliament) approval, and must avoid violating international law (e.g., UN Charter rules on force). Japan has participated in non-combat overseas missions before while staying within these restraints: - Intelligence gathering and monitoring: As in 2019, when Japan dispatched a destroyer and patrol aircraft to the Gulf of Oman (outside the Strait and Persian Gulf) to track Japan-related vessels after tanker attacks—purely informational, no escorts or combat. - Post-conflict support: Minesweeping or clearance after hostilities end is constitutionally allowed (e.g., Japan sent minesweepers to the Persian Gulf in 1991 post-Gulf War). Takaichi has confirmed the constitution would not bar this, though Japan has no current plans. - Logistical or cooperative roles: Expanding intelligence-sharing, diplomatic efforts, or non-SDF contributions (e.g., funding or coordination with the U.S. and others) are feasible. Japan has joined European nations in a joint statement expressing "readiness to contribute to appropriate efforts" for safe passage—but always "within the framework of the law."