South Korea and Japan Likely to Contribute to Strait of Hormuz Security
South Korea and Japan are unlikely to flatly reject President Donald Trump’s request for their forces to contribute to security in the Strait of Hormuz, according to U.S. experts. Jack Cooper, a senior fellow at the American Enterprise Institute, said on a CSIS podcast that Seoul and Tokyo “cannot simply say No” in this context, and should offer some form of contribution.
Cooper suggested a range of possible roles beyond sending combat units. He cautioned that the immediate yes-or-no question is nuanced by what kind of assistance is feasible. He pointed out that European allies have been reluctant to commit, implying that Japan and Korea may need to provide a concrete, selective contribution rather than none at all. He cited non-frontline options such as support activities that do not put allied ships at direct risk amid broader tensions.
He also highlighted the logistical reality: U.S. forces stationed in Korea and Japan are already spread thin, with many potentially diverted to the Middle East. This makes the political calculus for any sustained allied deployment especially delicate. Cooper suggested that Japan might offer help in ways that do not require direct confrontation, such as in-venue support or indirect logistics, including fuel replenishment in the Indian Ocean.
As an illustration, Cooper referenced the India Ocean supply chain and noted that a measured allied contribution could allow Washington to maintain pressure in the region without overextending American forces. He warned, however, that if the broader Iran crisis escalates, the question becomes how far Asia-Pacific partners can reliably align with U.S. strategy without provoking domestic political backlash.
Christi Govella, a senior fellow at CSIS, connected the discussion to the White House’s meeting with the U.S. and Japan on the following day. She said the Iran crisis has shifted the agenda toward what Japan can contribute, describing the issue as a “loyalty test” of sorts for Tokyo. Govella suggested the discussion would probe not only capabilities but also the political will to commit.
Govella emphasized that Japan’s decision-making process will be sensitive to domestic politics. She noted that Prime Minister Sanae Takai faces substantial political pressure, and that Tokyo will seek to calibrate any offering to avoid overburdening the administration while still signaling strong allied support.
Looking ahead, Govella argued that there are multiple avenues for U.S.-Japan and U.S.-Korea cooperation. She highlighted two possibilities for Japan: involvement in the Golden Dome, the United States’ next-generation missile defense concept, and contributing to missile production to replenish stockpiles depleted during the Iran crisis. Such measures would signal sustained allied capability without requiring large-scale deployment in the Middle East.
For U.S. readers, the debate matters beyond Korea and Japan. Washington depends on credible regional alliances to deter rivals, secure sea lanes critical to global energy trades, and sustain a stable supply chain for defense and technology sectors. A coordinated security posture in the Strait of Hormuz could reduce risk to American forces and deter destabilizing moves by Iran or other actors, while also shaping how the United States partners with Asia-Pacific democracies on security, technology, and defense industrial cooperation.