South Korea scrambles after Trump slashes drills to five days via Truth Social

SINGAPORE, 20 AUGUST 2026 —

South Korea on Edge as Trump’s Iran Dispute Rattles 72-Year US Alliance

SEOUL — A terse social media post from Washington upended decades of military planning when U.S. President Donald Trump announced on Monday that he was directing the Pentagon to “reduce” annual joint military drills with South Korea. The move, delivered via Truth Social just hours before the Ulchi Freedom Shield exercises were set to begin, described the drills as an “inappropriate and hostile” signal to North Korea and criticised Seoul for declining to join the U.S.-Israel campaign against Iran. The announcement, made on a South Korean public holiday marking liberation from Japanese colonial rule, triggered immediate scrambles in Seoul and Washington, exposing fresh strains in a security partnership that has underpinned regional stability since the 1950–53 Korean War.

By Wednesday, the two militaries had finalised adjustments: the 11-day exercise was shortened to five days, with several field drills scaled back. The Pentagon confirmed it was “actively working on executing” Trump’s directive, while U.S. Forces Korea commander General Xavier Brunson met South Korean Defence Minister Ahn Gyu-back at the Ministry of National Defence. The developments have reignited debate over the reliability of America’s security guarantees, a cornerstone of South Korea’s defence posture since the armistice that paused, but did not end, hostilities on the Korean Peninsula.

South Korean President Lee Jae-myung sought to temper concerns, telling his Cabinet on Tuesday that the alliance remained essential but stressing the need to bolster “self-reliant defence capabilities.” On Wednesday, he struck a conciliatory tone toward Trump, calling the decision “deeply infused with deliberations” aimed at reducing tensions on the peninsula. In a post on X, Lee said he “fully empathises” with Trump’s view that Seoul must take greater responsibility for its security and signalled willingness to assist in restoring freedom of navigation through the Strait of Hormuz—a critical energy corridor that Iran has blockaded. He added that his government would continue discussions on “practical contribution measures.”

Details not yet available on the specific nature of those contributions. Foreign Minister Cho Hyun told lawmakers there had been no advance notice of the drill reduction. “Neither our government nor U.S. officials knew what President Trump wrote on his Truth Social,” Cho said. “We were not notified in advance.” The National Assembly’s defence committee was scheduled to issue a formal response on Thursday, though aides described the atmosphere as “too sensitive at the moment” for substantive discussion.

Public reaction has ranged from frustration to outright anger. On social media, user Kim Won-tak wrote on Instagram: “We can’t trust everything Trump says.” Another, Choi Min, argued: “The U.S. prioritises practical benefits over loyalty to allies. They do it to Europe as well. We can’t eliminate our dependence on the U.S. overnight, but we should work toward self-reliance.” Others were more direct. “Trump puts his allies in a bind with tariffs, starts wars himself, and then demands they get involved,” wrote user Choi Joon-ho. “He really seems unhinged.”

Major South Korean media outlets framed the episode as a wake-up call. The Hankook Ilbo, one of the country’s most widely read dailies, warned of a “stark reality of a faltering Korea-U.S. alliance” and criticised what it called an “absurd” double standard in Washington’s treatment of North Korea versus its ally. Opinion on Seoul’s stance toward the U.S.-Israel campaign in Iran remains divided. A late-March poll by Hankook Research showed 38% of respondents supporting support for the U.S., 36% favouring neutrality, and 16% opposing involvement.

Opposition leader Jang Dong-hyeok of the People Power Party accused President Lee of causing a “diplomatic disaster” and “dismantling the South Korea-U.S. alliance” by declining Trump’s request for assistance. He warned the partnership could “unravel” and that Trump “could even push for a full withdrawal” of U.S. troops from South Korea. Conservative newspaper JoongAng Ilbo echoed this view, arguing in an editorial that an alliance “is not a one-sided favour but a reciprocal relationship,” and urging Seoul to demonstrate contributions “from investment and trade commitments to support for navigation through the Strait of Hormuz.”

Criticism of Trump’s approach also surfaced. The Korea Herald editorial board argued that while alliances can survive disagreement, they fray when major security decisions are communicated via social media. It suggested the move may have been timed to shift attention from “the protracted Iran war” ahead of U.S. midterm elections in November. The paper urged Seoul to respond “without either panic or complacency,” warning of “vulnerabilities created by over-dependence on decisions made in Washington.”

Analysts see echoes of Trump’s first term, when Washington and Seoul suspended major joint exercises after his 2018 summit with North Korean leader Kim Jong-un in Singapore. Those reductions were partly reversed after denuclearisation talks collapsed. Cha Du-hyeogn, vice president of the Asan Institute for Policy Studies, warned that Seoul can no longer assume predictability from Washington. “If South Korea is not willing to play the role that the United States expects of an ally, Washington can also reconsider elements of its security commitment,” he said. He added that unresolved trade talks—including a South Korean pledge to invest $350 billion in the U.S. in exchange for tariff relief—may be complicating the relationship.

Cha also highlighted the challenge Trump faces on North Korea. “If the U.S. were seriously pursuing negotiations with North Korea, denuclearisation would still have to be on the table,” he said. “Given that Trump went to war with Iran over its nuclear ambitions, it would be difficult for the U.S. to pursue talks with North Korea without addressing its nuclear programme.” The episode has revived longstanding debate over whether South Korea should pursue its own nuclear deterrent. Kim Jae-chun, professor of international relations at Sogang University, said Trump’s unilateral decision could erode confidence in U.S. security guarantees. “If that confidence deteriorates further, it could strengthen the argument in South Korea for self-nuclearisation,” he said.

The episode underscores broader questions about burden-sharing within the alliance and the durability of U.S. commitments amid shifting geopolitical priorities. With midterm elections looming and tensions rising in the Middle East, the incident has forced South Korea to confront uncomfortable truths about its strategic autonomy and the future of a partnership that has shaped the region for more than seven decades.

Related: Singapore