South Korea and Japan Sign Expanded $80 Billion Currency Swap Amid Asian Financial Stability Push

South Korea and Japan signed an expanded bilateral currency swap agreement worth $80 billion on Tuesday, more than doubling the previous arrangement and marking the largest financial-cooperation deal between Seoul and Tokyo since the framework was first established in 2001. The announcement was made jointly by the Bank of Korea and the Bank of Japan in a coordinated statement released at 09:00 Seoul time, ahead of a scheduled summit between President Lee Jae-myung and Prime Minister Sanae Takaichi later this week.

The new agreement increases the swap line ceiling from $30 billion to $80 billion, extends its term to five years, and crucially adds a yen-won leg alongside the existing dollar-denominated facility. Either central bank may now draw on the line in either currency, a structural change that officials in both capitals describe as a hedge against sudden dollar liquidity squeezes of the kind that destabilised regional markets in 2022 and 2023.

What the deal contains

The agreement, signed by Bank of Korea Governor Rhee Chang-yong and Bank of Japan Governor Kazuo Ueda, has three operational components. The first is a dollar-swap leg of $50 billion, replacing and expanding the prior $30 billion line that was renewed in November 2024. The second is a new local-currency leg of approximately $30 billion equivalent, denominated in yen and won, available for trade settlement and emergency liquidity provision. The third is a standing crisis-coordination mechanism that allows ad hoc consultation outside formal Group of Twenty processes.

Drawings under the facility require approval by the requesting central bank's monetary policy board and notification to the lending bank, with a settlement window of 48 hours. Interest is set at the overnight indexed swap rate of the relevant currency plus 50 basis points, a level Tokyo officials describe as concessional relative to standalone market borrowing during stress periods.

Why now

The expansion comes against a backdrop of three converging pressures. The won has weakened approximately 6 per cent against the dollar over the past three months, trading at 1,392 on Tuesday. The yen has been similarly volatile, with the Bank of Japan intervening twice in March to support the currency at levels above 158. And capital outflows from broader emerging Asia accelerated in the first quarter, with the Institute of International Finance recording $14 billion in net portfolio outflows from regional bond markets between January and March.

"This swap line is precautionary, not corrective," Governor Rhee said at the Seoul press briefing. "It is designed to ensure that, in the event of disorderly market conditions, neither economy faces dollar funding shortages that would impair real economic activity."

Regional context and ASEAN coordination

The Korea-Japan agreement is the first of an expected series of bilateral and multilateral expansions following the ASEAN+3 finance ministers and central bank governors meeting in Manila on 4 May. Officials familiar with the discussions said the Chiang Mai Initiative Multilateralisation (CMIM), the regional liquidity safety net established in 2010, is being reviewed with a view to increasing its $240 billion ceiling and removing the IMF-linked conditionality that has historically discouraged drawings.

China, through the People's Bank of China, has been holding parallel discussions with both Korea and Japan on tripartite arrangements, although Tokyo officials have signalled a preference for keeping the new line bilateral until political relations with Beijing stabilise after recent trade frictions.

Five facts about the new swap

• $80 billion ceiling — up from $30 billion under the prior arrangement.
• Five-year term — extending through April 2031, with automatic renewal absent objection.
• Dual-currency capability — drawings possible in dollars, yen or won.
• 50 basis points spread — over the relevant overnight indexed swap rate.
• 48-hour settlement — fastest of any active Asia-Pacific swap line.

Market reaction

The announcement steadied currency markets immediately. The won strengthened from 1,398 to 1,392 within an hour of the joint statement, while the yen firmed from 156.8 to 156.1 against the dollar. The KOSPI closed up 0.9 per cent at 2,734, led by financial and exporter shares, while the Nikkei 225 finished 0.6 per cent higher at 38,920.

South Korean five-year credit default swaps tightened by 4 basis points to 28, the lowest level since November 2024. Japan's equivalent contracts, less liquid, eased by 2 basis points.

Analysts at Nomura and Citigroup described the move as "materially positive" for Asian financial stability, with Citigroup's Johanna Chua arguing that the bilateral deal effectively pre-positions liquidity ahead of any 2026 episode of dollar strength linked to US fiscal or monetary developments.

Political dimension

The deal carries political weight beyond its financial mechanics. President Lee, elected in June 2025, has prioritised stabilising Korea-Japan relations after the turbulence of the previous administration's final year. Prime Minister Takaichi, in office since November, has reciprocated by softening Tokyo's posture on historical disputes and accelerating economic-security cooperation.

Both leaders are scheduled to issue a joint statement on Friday in Tokyo covering the swap line, semiconductor supply-chain coordination and a renewed framework for trilateral cooperation with the United States. A Lee-Takaichi-Trump meeting on the margins of the Asia-Pacific Economic Cooperation summit in Lima in November is also on the agenda.

What to watch

The next markers for the broader regional framework are the ASEAN+3 communiqué on 4 May, the Group of Seven finance ministers' meeting in Banff on 22 to 24 May, and the IMF's Article IV consultation with Korea, which begins on 12 May. If the CMIM expansion advances at the May meeting, the Korea-Japan agreement will be remembered as the opening move in the most significant regional financial-architecture upgrade since the 2008 global financial crisis.

For now, the message from Seoul and Tokyo is one of pre-emptive reassurance: an enlarged, more flexible safety net designed to absorb shocks before they require correction.