South Korean Assistance to the U.S. in the War with Iran: Between Allied Duty and National Interests
By Konstantin Asmolov – New Eastern Outlook – October 17, 2026
South Korean President Lee Jae-myung is trying to maneuver between pressure from the United States, which demands participation in the conflict with Iran, and risks to national security and reputation, opting for a strategy of stalling and minimizing a direct military presence.
The previous article explained why South Korea refused to join the United States in the “denuclearization of Iran” and how, in response, Donald Trump struck at Lee Jae-myung’s ambitions, nudging him toward the desired choice. And although President Lee’s rhetoric ultimately seems anti-war, in reality there are many loopholes remaining: for example, not a new contingent, but a decisive increase and expansion of the existing contingent’s mandate.
“No!” or “Maybe”
On September 16, Donald Trump said on social media that countries that “provided no assistance” would, after the war with Iran ended, have to “compensate” the United States for damages. Trump did not say whom he meant.
On September 17, First Vice Minister of Foreign Affairs of the Republic of Korea Park Yun-ju stated that the ROK’s participation in an international operation in the Strait of Hormuz region depends on a number of factors and is tied not only to relations with the United States but also to the safety of navigation, energy supplies, and the protection of the country’s citizens.
On September 18, Lee Jae-myung stated that South Korea would not deploy troops or military equipment in a way that would draw the country into the war between the United States and Iran. However, he allowed for minimal measures to protect South Korean vessels, oil delivery routes, and citizens, pointing to disruptions in crude oil supplies as one of the risks.
Apparently, eyebrows were raised in Washington, after which on September 19 the Blue House indicated that President Lee Jae-myung’s remarks did not amount to a rejection of Trump’s call for military cooperation. An administration official said that the government is considering practical ways to assist in close contact with the international community, including the United States.
The Specifics of the Future Conflict
Because the war with Iran follows a sine curve, and Donald Trump’s promises to “flatten Iran” alternate with talk of peace, it is possible that, once Trump enters a peace phase, Seoul’s need to rush to help the United States will temporarily disappear. Therefore, let us consider the scenario in which Seoul is actively pressed to help Washington—at least as proof of the Republic of Korea’s allied status.
Compared with previous deployments of South Korean troops as U.S. allies—whether in Vietnam or Iraq—they find themselves in a far more difficult situation. In both cases, this was a ground war in which South Koreans performed auxiliary tasks and mainly carried out clearing operations and fought poorly armed guerrillas, or guarded South Korean specialists while stationed in territory controlled by the Kurds.
However, although Iran does not have nuclear weapons, it has ballistic missiles and kamikaze drones in abundance. This means that wherever South Korean troops are located, they could become targets, especially since South Koreans have no experience countering such a threat, and any serious losses would both damage the country’s domestic political standing and hurt the president’s reputation. As the saying goes, victory has many fathers, but defeat always has one—and he is often the scapegoat.
If anything goes wrong, President Lee will be symbolically held responsible as the person who initiated South Korean participation in the war. At the same time, he may also be criticized for the fact that, in seeking to neutralize the threat of a military coup, he carried out a whole set of measures that could be seen as a certain decline in military readiness—which, alas, performed poorly when confronted with Iranian drones.
Lee Jae-myung’s Two Strategies
Lee Jae-myung understands this situation perfectly and will therefore adhere to two strategies.
The first is to stall for as much time as possible, especially since, under the country’s constitution, sending troops abroad must go through parliament. Because the conflict is escalating and there is domestic opposition, the timing of any troop deployment remains in question.
The situation is interesting: parliament is generally under President Lee’s control, and if he says “yes,” the National Assembly will vote according to his will. But if Lee throws up his hands and says, “I’m in favor, but the Korean people are against it, and we have a democracy, which I cannot go against,” then, on the one hand, outside observers may perceive this as a mutiny on board; on the other, the United States may find another painful way to push Seoul in the right direction. The hope here is rather that the geopolitical situation or Trump’s mood will change and assistance will not be needed.
The second strategy is to send assistance but minimize Korean participation in direct combat: patrol operations, intelligence and surveillance, demining assistance, medical or other humanitarian aid. As a government source told Yonhap, “we are discussing how to contribute safely, without direct participation in combat,” and according to the Dong-A Ilbo, South Korea is considering sending a P-8A Poseidon maritime patrol aircraft designed for long-range maritime surveillance, a supply ship, and explosive ordnance disposal specialists.
Another option is the Cheonghae Unit (the newest destroyer with a special forces team aboard), which has long been in the Middle East and is engaged in protecting shipping and responding to threats, including piracy. Increasing its size is not the same as deploying a new contingent, and when, on July 24, 2019, during one of the previous rounds of escalation, the United States demanded not only an increase in South Korea’s share of the costs of maintaining American troops but also the deployment of South Korean naval forces to the Strait of Hormuz, the Cheonghae contingent, which was supposed to fight Somali pirates, “expanded its area of operations” from the Gulf of Aden to the Gulf of Oman and the Arabian Gulf. In 2021, Cheonghae was also in the strait, but it was withdrawn to leave a window of opportunity for negotiations after Iran seized a South Korean tanker.
Iran’s Response: What Matters to Tehran Is the Fact Per Se, Not the Scale
It seems that the Iranian side responds in this respect much as North Korea does: what matters is the very fact of Seoul’s participation on the side of the United States, not the scale of such measures. Diplomats and officials have already issued a series of warnings, voicing fairly specific and inconvenient response options for Seoul.
On September 7, Iranian Foreign Ministry spokesman Esmail Baghaei published a warning in Korean, stating that Tehran would regard the military presence or participation of any third country in operations in the Persian Gulf and the Strait of Hormuz as direct support for the aggressor, which could entail “serious consequences.” At the same time, the diplomat stressed the importance of friendly relations with Seoul.
Earlier, Iranian expert Mohammad Marandi said that South Korea’s participation in the war could make it an enemy of Iran, and retaliatory strikes could affect not only military but also economic assets of South Korean companies in the Persian Gulf countries. South Korea gets most of its energy resources from the Near and Middle East, and a blockade of the Strait of Hormuz and attacks on vessels delivering petroleum products to South Korea would force it to urgently rethink its supply chains.
At the same time, the most convenient and safe backup supply-chain option is also uncertain, because it involves obtaining petroleum products from Russia. Talks on this issue have already begun, and South Korea is trying to prepare its European partners for the possibility of obtaining Russian petroleum products. But, first, the EU still has to be persuaded; second, it is not at all clear that Moscow would welcome this with open arms, knowing that this is not a conceptual turn toward Russia but a desire to solve a problem now that is de facto completely irrelevant to Moscow.
In Lieu of a Conclusion
Lee Jae-myung remains trapped. Refusing to send troops could lead to a further deterioration in relations with Trump, who could take actions against South Korea, such as imposing new tariffs. Sending troops carries certain reputational and domestic political risks. This is harder than a “test of strategic thinking” and a choice between two great evils.
Therefore, we will follow with great interest whether a parliamentary discussion finally takes place and what its verdict will be. It is interesting to see how ready South Korean military personnel and South Korean weapons are to take part in a modern war.
Konstantin Asmolov, PhD in History, leading research fellow at the Center for Korean Studies of the Institute of China and Modern Asia at the Russian Academy of Sciences
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