Japan announced strict conditions for deploying its Self-Defense Forces (SDF) to the Strait of Hormuz amid ongoing regional tensions. Defense Minister Shinjiro Koizumi outlined the three criteria during an online defense ministers' meeting co-hosted by the UK and France on May 13, 2026. The conditions include an official ceasefire agreement between the US and Iran, established communication channels with Iran, and a reduction in threats in the region [1, 2, 3].
Potential missions for the Japanese forces under these conditions could include clearing abandoned mines and protecting civilian and commercial vessels transiting the strategic shipping lane. However, Koizumi noted that clearing mines before a ceasefire could be viewed as an act of war against the party that laid them, conflicting with Japan’s constitutional restraints on overseas military deployments [1, 2, 3]. He emphasized that "communication with the US is very important" and that "without ceasefire and security guarantees, Japan cannot ensure the legality and safety of its mission," adding that "information sharing and strategic coordination with the US is a prerequisite of the prerequisites" [1, 3].
Japan has maintained diplomatic contacts during the crisis, with Prime Minister Sanae Takaichi holding three phone calls with Iranian President Masoud Pezeshkian since fighting broke out in February 2026. The conflict escalated after the US and Israel launched a joint offensive against Iran on February 28, 2026, driving up energy prices and disrupting shipping lanes [4]. Pakistan brokered a ceasefire on April 8, which paused the war, and efforts continue toward a permanent settlement [4].
The UK government released a joint statement following the May 13 meeting, affirming respect for each nation's constitution in troop deployments and acknowledging Japan’s legal constraints [1, 2]. Japan currently imports about 90% of its energy from the Gulf region and has released oil from strategic reserves amid supply concerns [4].
Japan’s next step is contingent on further progress in the ceasefire talks and regional security. The government will monitor advances in diplomacy and threat reduction before deciding on any SDF deployment to the Strait of Hormuz.
