The Iran Crisis and the Japan-U.S. Alliance: The Middle East Deployment Questions the Void in East Asian Defense

The attack on Iran by the U.S.-Israel coalition, which began on February 28, 2026, has exposed the strategic contradictions of the Japan-U.S. alliance. The deployment of U.S. forces in the Middle East, the vulnerability of energy security, and the potential for Japan's Self-Defense Forces to conduct mine-clearing operations—these factors are having a serious impact on Japan's defense posture in East Asia.

On March 14, the U.S. Department of Defense announced its decision to urgently deploy main forces of the U.S. military stationed in Japan to the Middle East. According to reports from the Chosun Ilbo, an amphibious assault ship based in Sasebo and 2,500 Marines were dispatched in response to the blockade of the Strait of Hormuz. This move indicates that the presence of U.S. forces in East Asia is rapidly declining.

For Japan, this development poses a dual threat. First, the extraction of U.S. military capabilities from Japan weakens the deterrent against regional provocations from China and North Korea. Second, the blockade of the Strait of Hormuz by the Iranian Revolutionary Guard Corps could deliver a devastating blow to Japan's energy supply. Japan relies on the Middle East for about 75 percent of its oil imports and is also the world's second-largest importer of liquefied natural gas (LNG). With Qatar Energy and the Abu Dhabi National Oil Company (ADNOC) invoking force majeure clauses, Japan's electricity costs and trade deficit are expected to worsen sharply.

On March 16, Kent Calder, director of the Edwin O. Reischauer Center for East Asian Studies at Johns Hopkins University, stated in an interview with Jiji Press that the summit meeting between Prime Minister Sanae Takai and President Donald Trump would reaffirm the importance of the Japan-U.S. alliance. Calder emphasized that ahead of President Trump's visit to China, "Japan needs to redirect U.S. attention from China to itself," and pointed out that "President Trump is extremely transactional and tends to prioritize economic interests over geopolitical considerations."

In this context, the most pressing challenge facing the Japanese government is the request for the Self-Defense Forces to participate in mine-clearing operations in the Middle East. According to Calder, the Takai-Trump meeting is expected to focus on the Self-Defense Forces' mine-clearing activities in response to the deteriorating situation regarding Iran. Japan has a track record of dispatching four mine sweepers and a supply ship in 1991 under international pressure after the Gulf War. A similar development is anticipated this time, but the political and strategic costs cannot be ignored.

If Japan dispatches a mine-clearing unit, its self-defense capabilities in East Asia will further decline. In March 2026, North Korea unveiled an 8,000-ton-class destroyer, showcasing firepower that surpasses all active surface vessels of the Japan Maritime Self-Defense Force. Chinese Foreign Ministry spokesperson Guo Jiekun issued a warning in March that Japan is involved in activities supporting Taiwan's independence. In the midst of rising regional tensions, redirecting Japan's defense resources to the Middle East significantly increases strategic risks.

Japan's response has been extremely cautious. While Prime Minister Takai expressed "serious concerns," she avoided explicitly supporting the U.S.-Israel attack. This reflects a balancing diplomacy aimed at maintaining a strategic alliance with Washington while not undermining practical relations with Iran. Historically, Japan has valued its economic relationship with Iran. Japan's strategy for diversifying energy imports aims to mitigate the risks of dependence on a single source, but the escalation of conflicts throughout the Middle East could invalidate this strategy itself.

From the perspective of energy security, Japan's vulnerability is extremely serious. According to an analysis by the Middle East Council on Global Affairs, East Asian countries depend on the Middle East for about 60 percent of their oil imports. A blockade of the Strait of Hormuz could halt about one-fifth of the world's oil and LNG trade. The cessation of LNG production in Qatar, the force majeure declarations by Bahrain Petroleum Company (BAPCO) and Kuwait Petroleum Corporation (KPC), and the shutdown of the largest oil refinery in the UAE, Ruwais, have brought a dual energy shock to the entire Asian market.

The Japanese government is currently facing rising electricity generation costs, increasing inflationary pressures, and the possibility of power shortages during the summer peak demand period. If the disruption of LNG supply continues for an extended period, Japan's economic growth rate will significantly slow, severely impacting corporate production activities and household living standards.

Strategically, Japan has reached a point where it needs to reassess its traditionally passive diplomatic posture. Despite being the world's largest energy import market and accounting for a significant portion of global economic output, Asian countries have played a limited role in the security structure of the Middle East. Geographic distance, limited power projection capabilities, and the long-standing reality of the U.S. being the primary defense partner in the region have kept Asian countries as economic actors.

However, the current crisis has exposed this asymmetry. Asian economies, including Japan, are deeply dependent on the Middle Eastern energy market, yet they have little influence over the escalation of conflicts or regional destabilization. The scale of this vulnerability suggests that Asian governments need to reconsider their diplomatic and security roles in the Middle East.

For Japan, adopting a more proactive stance means several options. First, it should carefully encourage Washington to avoid escalation. Japan can leverage its trade agreements and alliance with the U.S. to exert influence on the Trump administration. Second, it should strengthen diplomatic engagement through regional multilateral frameworks. Japan has committed to cooperation with the Association of Southeast Asian Nations (ASEAN) in its 50th-anniversary partnership to create a prosperous and sustainable economy in the Indo-Pacific region. This framework could also be applied to stabilize the Middle East.

Third, limited cooperation with China should also be considered. Beijing has a track record of mediating détente between Saudi Arabia and Iran in 2023. Japan's collaboration with China to maintain this reconciliation could contribute to regional de-escalation. Of course, this would require careful coordination within the framework of the Japan-U.S. alliance.

Ultimately, Japan faces a difficult choice among three priorities: alliance obligations, energy security, and national defense. The deployment of U.S. forces to the Middle East indicates that as long as Japan functions as part of the U.S.'s global strategy, there is a constant risk of weakening its own defense posture in East Asia.

The alternative—namely, ongoing fragmentation and reactive crisis management—would leave the Asian economy perpetually exposed to shocks from a region that is essential to its prosperity. The current conflict serves as a wake-up call. If Asian countries desire reliable energy supplies, they must take on a more proactive role in efforts to deter escalation and resolve conflicts. For Japan, this may mean redefining its alliance and expanding its strategic autonomy.