Japanese Prime Minister Sanae Takaichi will be the first U.S. ally to visit the White House since President Trump asked partners to help send ships to patrol the Strait of Hormuz. Trump has since said the United States does not need help, but Takaichi is expected to face pressure to accommodate U.S. requests while operating within Japan’s legal and political limits.
Takaichi has said Japan has no plans to dispatch warships to the Middle East but has not explicitly rejected Trump’s plea. She told lawmakers she will “clearly explain what we can do and cannot do based on Japanese law” ahead of the White House meeting.
Legal constraints shape Tokyo’s options. Japan’s constitution renounces war as a means of settling disputes. A 2015 reinterpretation of security laws allows limited collective self-defense if Japan or its allies face a “survival-threatening situation,” but deploying forces into active combat zones remains legally and politically fraught. Takaichi has avoided ruling on the legality of the U.S.-Israeli attack on Iran; declaring it justified or unlawful could affect any legal rationale for dispatching the Self-Defense Forces (SDF).
Public opposition to involvement in the Iran conflict is strong. A poll for The Asahi Shimbun found 82% of Japanese do not support the war, and more than half are dissatisfied with Takaichi’s reticence on the issue. Despite her popularity and push for higher defense spending, there is limited domestic appetite for sending forces into a Middle East conflict.
Tokyo has used narrow, legally framed deployments in the past. Japan sent minesweepers to the Persian Gulf in 1991, noncombat troops to Iraq in 2004, and a destroyer and patrol plane to the Gulf of Oman in 2020, always with mandates to avoid active combat. Former defense official Kyoji Yanagisawa warns that escorting tankers through the Strait of Hormuz while war continues could amount to entering a state of war with Iran and jeopardize the SDF’s unblemished record of no combat casualties. Yanagisawa, who helped send troops to Iraq, opposes putting SDF personnel at similar risk. Takaichi, by contrast, supports expanding the SDF’s offensive capabilities.
Takaichi’s visit was also timed ahead of a planned Trump trip to China, with hopes she could gain U.S. support on Tokyo’s disputes with Beijing over Taiwan or secure protections if Trump reaches a deal with Chinese leader Xi Jinping. The Iran war, however, has led Trump to postpone the China trip and now threatens to overshadow other issues, including Japan’s pledged $550 billion investment package in the U.S. tied to lower American tariffs.