US-South Korea Alliance Shaken After Trump Cuts Joint Military Drills Over Iran Dispute

An activist wearing a cutout mask depicting US President Donald Trump holds a placard covered with 'No' stickers during a rally against Washington's demand for South Korea to deploy troops to the Strait of Hormuz, in Seoul, South Korea, March 16, 2026 [Kim Soo-hyeon/ Reuters]. Seoul, South Korea – The order arrived not through diplomatic channels but via a post on social media, just hours before the annual joint military exercises between South Korea and the United States were set to begin.

US President Donald Trump, writing on his Truth Social platform, announced that he was directing the Pentagon to "substantially reduce" the drills, describing them as sending an "inappropriate and hostile" signal to North Korea. He noted pointedly that Seoul had declined to join the US and Israel’s war on Iran.

The surprise announcement caught South Korean officials off guard during a public holiday and triggered a scramble in both Seoul and Washington, DC. The Pentagon stated it was working to execute the directive, while in Seoul, General Xavier Brunson, commander of US Forces Korea, met with Defense Minister Ahn Gyu-back at the Ministry of Defence. By Wednesday, the two militaries agreed to shorten the exercise from 11 days to five and scale back field training drills.

The move has caused anxiety and anger in Seoul, reigniting debates over the reliability of the security guarantee in place since the 1950-53 Korean War. South Korean President Lee Jae Myung urged calm, emphasizing the importance of the alliance while calling for strengthened self-reliant defense capabilities. In Parliament, Minister of Foreign Affairs Cho Hyun confirmed that officials received no advance notice of the decision.

Public reaction on social media and in local editorials reflected deep frustration regarding over-dependence on Washington and the stark reality of a faltering alliance. Meanwhile, political figures in the opposition People Power Party, including leader Jang Dong-hyeok, criticized the government for turning down US requests regarding Iran and risking the stability of the pact.

Analysts like Cha Du Hyeogn of the Asan Institute for Policy Studies and Kim Jae Chun of Sogang University noted that the episode highlights the unpredictable nature of US commitments and could revive debates over South Korea pursuing its own nuclear capabilities or reassessing its foreign policy posture.