Seoul
South Korea's capital; a global finance hub whose markets seize when the Gulf burns.
Last refreshed: 30 March 2026
Will the Gulf war drain the missile stock that Seoul relies on for its own defence?
Latest on Seoul
- What is Seoul?
- Seoul is the capital city of South Korea, home to roughly 10 million people and located about 50 km from the North Korean border. It is the country's political, financial, and cultural centre, and home to the KOSPI stock exchange.
- Why did the KOSPI crash in March 2026?
- South Korea's KOSPI fell 12% in a single session — its worst day on record — when the Strait of Hormuz appeared to close during the Iran conflict. South Korea imports the bulk of its oil and LNG from Gulf sources, making it acutely sensitive to supply disruption.Source: Lowdown
- How far is Seoul from North Korea?
- Seoul is approximately 50 km south of the Demilitarised Zone (DMZ) that divides the Korean Peninsula. This proximity has defined Seoul's security posture for decades and makes THAAD missile defence a political priority.
- How does the Iran war affect South Korea's economy?
- South Korea is one of the world's largest importers of Gulf oil and LNG. Rising Brent Crude prices toward the $90-95 corridor triggered by the Iran conflict drive inflation and weaken export competitiveness. The KOSPI's 12% crash on the day Hormuz appeared closed was the most direct market signal.Source: Lowdown
- Does the Iran war affect South Korea's missile defences?
- Yes. The THAAD interceptor stock shared with US forces in the Gulf is the same arsenal that provides part of Seoul's layered defence against North Korean missiles. With 100-150 THAAD interceptors expended in the first eight days of the Iran conflict, replenishment is estimated to take two to three years.Source: Lowdown
Background
Seoul, founded in 1394 as Joseon's capital, is today a city of roughly 10 million and the political, financial, and cultural heart of South Korea. Home to the Blue House presidential residence and the headquarters of the Korean Peninsula's principal financial exchanges, Seoul sits 50 km from the Demilitarised Zone separating it from North Korea, making it perpetually exposed to both peninsular risk and global shock.
The Iran conflict exposed Seoul's structural energy vulnerability with blunt force. When the Strait of Hormuz appeared to close in early March 2026, South Korea's KOSPI fell 12% in a single session — its worst day on record — as markets priced in supply shock for an economy that imports the vast majority of its oil and LNG from Gulf sources . Rising Brent prices feeding a $90–95 corridor deepened the inflationary pressure .
Seoul's dilemma is the one facing every US-alliance capital without Gulf oil alternatives: the THAAD interceptor stock that protects it is the same arsenal burning through Gulf air defence missions , and the AI governance laws Seoul is pioneering domestically mean little if its export-dependent economy buckles under a prolonged energy shock.
