On March 14, 2026, U.S. President Donald Trump took to his favored megaphone—social media platform Truth Social—to issue a pointed request: South Korea, China, Japan, France, and the United Kingdom should send warships to the Strait of Hormuz. The call came as the strait, a vital artery for global oil, faced mounting threats from Iran, which was accused of laying mines and effectively choking off the passage. As tensions simmered between the U.S.-Israel alliance and Iran, the question of South Korea’s military role in this high-stakes maritime drama leapt to the fore.
The South Korean government, as of March 15, had yet to receive an official request from Washington. Nevertheless, the expectation among officials and experts was that such a request could land on Seoul’s desk at any moment, given the urgency of the situation and Trump’s public naming of Korea among the key players. According to Yonhap News, a government official remarked, “There has not been an official dispatch request from the U.S., but with President Trump’s statement, it is highly likely that a formal request will soon follow.”
The Strait of Hormuz is no ordinary waterway. About 20% of the world’s oil passes through this narrow chokepoint—just 39 kilometers wide at its narrowest. With Iran reportedly mining the strait and launching attacks on civilian vessels, the risks for any naval operation are substantial. South Korea, which relies heavily on stable oil imports, finds itself in a delicate position: balancing its alliance with the U.S. against the potential to antagonize Iran, a key oil supplier.
In the event that South Korea does commit naval forces, the most likely candidate is the Cheonghae Unit. This naval detachment, currently stationed in the Aden Bay with a 4,400-ton destroyer and approximately 262 to 300 personnel, has a track record of operating in hazardous waters. Back in January 2020, after the U.S. killed Iranian General Qasem Soleimani and tensions soared, Seoul expanded the Cheonghae Unit’s mission to escort Korean commercial ships through the Strait of Hormuz. At that time, the deployment was a unilateral move, justified under a legal clause allowing the unit to operate outside its usual zone to protect Korean nationals.
But this time, the circumstances are markedly different. Trump’s demand is not for a solo Korean mission but for participation in a U.S.-led multinational force. That distinction is critical. As SBS Biz reported, “A deployment as part of a multinational force would fundamentally change the Cheonghae Unit’s mission and require approval from the South Korean National Assembly.” The Cheonghae Unit’s current mandate, as stipulated in its National Assembly-approved deployment, is limited to the Aden Bay. While a clause permits emergency operations elsewhere for the protection of Korean citizens, joining a multinational military operation in a live conflict zone would stretch, if not exceed, that legal framework.
Political hurdles loom large. Approval from the National Assembly is anything but guaranteed. Lawmakers are wary of the risks—both military and diplomatic. The specter of South Korean forces being drawn into the heart of a U.S.-Iran conflict, especially as part of a coalition, raises the stakes dramatically. As Munhwa Ilbo noted, “Given the dangers and the political sensitivities, the likelihood of National Assembly approval is seen as low.” The risk of antagonizing Iran, which could retaliate economically or otherwise, weighs heavily on decision-makers. Moreover, questions have been raised about the international legal justification for the U.S. and Israel’s strikes on Iran, further complicating Seoul’s calculus.
In the background, South Korea’s defense and foreign policy community is abuzz with debate. Some experts, like Yoo Ji-hoon of the Korea Institute for Defense Analyses, advocate for a cautious, conditional approach. “The optimal solution for Korea is neither immediate deployment nor outright refusal, but limited readiness and conditional participation,” Yoo advised, according to Newsis. He emphasized that any military involvement should prioritize the protection of Korean vessels and nationals, rather than broader coalition objectives.
The Cheonghae Unit itself is no stranger to high-risk missions. Since its inception in 2009 under a United Nations Security Council resolution, it has participated in anti-piracy operations and supported the evacuation of Korean nationals from hotspots like Libya and Yemen. Its recent rotations have seen the 4,400-ton destroyer Dae Jo-yeong and a complement of 262 personnel maintaining readiness in the Gulf of Aden. According to Donga Ilbo, “The Cheonghae Unit is currently maintaining a defensive posture in the eastern waters of Oman for the protection of our citizens.” The unit has supported the safe passage of over 40,000 vessels over its history.
Yet, the potential mission in the Strait of Hormuz would be a different beast. The area is laced with mines, and the risk of missile or drone attacks from Iran is ever-present. Trump himself underscored these dangers in his social media post, stating, “Even if they [Iran] have been badly beaten, it’s easy for them to send a drone or drop a mine or fire a short-range missile somewhere in this strait.” According to Munhwa Ilbo, this is part of the rationale for seeking a multinational approach—to spread the operational burden and reduce direct U.S. exposure.
South Korea’s government faces a classic diplomatic dilemma. On one hand, the U.S. is its top security ally, and ignoring an American request could strain the alliance. On the other, antagonizing Iran could jeopardize energy security and invite retaliation. The government’s official stance, as reported by Yonhap, is one of careful deliberation: “If an official request arrives, the government will review it thoroughly, considering all risks and national interests.”
Political opposition is expected, especially if the deployment is framed as taking sides in the U.S.-Iran conflict. Past National Assembly debates over Cheonghae Unit missions have already highlighted concerns about mission creep and legal overreach. This time, with the prospect of direct involvement in a multinational military coalition, those debates are likely to be even more intense.
Meanwhile, South Korea is not alone in its predicament. Other nations named by Trump—Japan, France, and the UK—are also weighing their responses, with each facing its own domestic and diplomatic constraints. As one South Korean military source told SBS Biz, “We also need to watch how neighboring countries like Japan respond, and a lot of careful consideration will be needed.”
For now, the Cheonghae Unit remains on standby in the Aden Bay, its sailors and officers following the news as closely as anyone. The next move depends on whether the U.S. formalizes its request, and how South Korea’s government and parliament choose to respond. One thing is clear: in the choppy waters of the Strait of Hormuz, every decision carries weight far beyond the horizon.