Korea's foreign exchange reserves fell by $3.97 billion in a single month, the Bank of Korea announced on the 3rd. Reserves declined to $423.66 billion at the end of March, reversing course after a month of gains. The sharp drop — the largest in 11 months since April 2025 — resulted from a stronger U.S. dollar reducing the dollar-denominated value of assets held in other currencies, and from the BOK's market stabilization measures including foreign exchange swaps with the National Pension Service as the won-dollar exchange rate surged. Korea's global ranking in foreign reserves fell two notches to 12th as of February. This marks the first time in 26 years that Korea has dropped out of the top 10.
The rapid decline in foreign reserves — effectively the nation's "dollar emergency fund" — is alarming at a time when external uncertainties are mounting due to the Iran war. Market stabilization measures may have been unavoidable given that the won-dollar exchange rate soared to levels last seen during the global financial crisis, but authorities must be vigilant about the draining dollar coffers. The foreign exchange authorities conducted net sales of approximately $22.5 billion in the fourth quarter of last year alone, yet failed to stabilize the market. This is evidence that calming exchange rates through foreign reserves is practically futile. The exchange rate, which stood at around 1,400 won per dollar at the beginning of the fourth quarter last year, has already surged well past 1,500 won. With foreign investors pulling 2 trillion to 3 trillion won daily from Korea's stock market — which is vulnerable to external variables — continuing to deplete reserves in the name of market stability could amount to "pouring water into a bottomless jar."
To be sure, Korea is not at a point where exhaustion of reserves is a concern. Reserves remain well above the "psychological Maginot line" of $400 billion, and dollar liquidity is ample. Yet these are times of profound uncertainty where no one can predict what lies ahead. Adverse factors capable of rattling the foreign exchange market — the course of the war, sudden moves by U.S. President Donald Trump — could emerge at any moment. The planned $350 billion in investment in the United States is an additional burden. Foreign reserves are a shield that protects our economy from potential crises and maintains international credibility. Authorities must not allow this "economic breakwater" to crumble by clinging to short-term symptomatic remedies while ignoring the fundamental solution to exchange rate defense: improving the economy's structural fundamentals.