For years, South Korea has been a geopolitical paradox: a robust economy and a leading arms exporter that nonetheless punches below its weight in shaping the Indo-Pacific order. As a treaty ally of the United States, Seoul has balanced its security ties with Washington against deep economic interdependence with Beijing. But the war in Ukraine and a change of leadership in Seoul are now resetting that calculus.
The incoming president, Yoon Suk-yeol, has signaled a sharp departure from his predecessor Moon Jae-in's approach. Moon focused heavily on engagement with North Korea, a policy that yielded little progress on denuclearization. Yoon, by contrast, has described South Korea as a “global pivotal state” and vowed to work more closely with like-minded democracies. In a clear break, he stated that “dealing with North Korea is an important task for any South Korean government… it should not represent the whole of Seoul’s diplomacy.”
Structural Frictions in the Quad
The shift comes as the Quadrilateral Security Dialogue—comprising the United States, Japan, Australia, and India—faces internal strains. India’s refusal to distance itself from Russia has created friction with Washington. Despite a cordial meeting between US and Indian officials earlier this month, the Biden administration has warned New Delhi against undermining Western sanctions on Moscow. US Secretary of Defense Lloyd Austin and Secretary of State Antony Blinken, during a visit to Kiev, made clear that America’s strategy is full containment of Russia.
Indian officials have pushed back. External Affairs Minister Subrahmanyam Jaishankar argued that “India’s approach should be guided by our national beliefs and values, by our national interest, and by our national strategy.” Finance Minister Nirmala Sitharaman affirmed that India would maintain its defense ties with Russia as a matter of national security. The diplomatic tit-for-tat escalated when President Joe Biden pointed to India’s “own problems” with human rights and democracy, while the Pentagon hinted at potential sanctions if New Delhi proceeds with the S-400 missile system purchase from Russia.
These tensions have opened the door for South Korea to emerge as an alternative partner in US-led security frameworks. Yoon has declared his willingness to “positively review joining” an expanded Quad, and Seoul already participates as a regular guest in expanded G7 meetings. South Korea’s advanced industrial-military complex and democratic credentials make it a natural fit for such groupings.
To be sure, India remains a major strategic focus for the West. During the fourth US-India 2+2 Ministerial Dialogue, Biden and Prime Minister Narendra Modi pledged comprehensive strategic cooperation, dispelling talk of a rupture. India has also deepened ties with the United Kingdom and the European Union, with EU President Ursula von der Leyen visiting New Delhi for the Raisina Dialogue. Yet the structural tensions are unlikely to fade soon.
Yoon has explicitly criticized Moon’s “reluctance to take a firm stand on a number of issues that have roiled the relationship between Washington and Beijing,” which he said created “an impression that South Korea has been tilting toward China and away from its longtime ally, the United States.” Instead, the president-elect argues, Seoul should abandon “timidity” and embrace a more assertive role. This repositioning could reshape the Indo-Pacific security architecture, especially as the Quad explores “Quad Plus” formats.
For a deeper look at how geopolitical crises are driving shifts in global finance, see our analysis on the petroyuan's rise. Meanwhile, the evolving US-India relationship is also tested by India's balancing act in the Gulf, as explored in India's Gulf diplomacy. And as South Korea recalibrates its alliance with Washington, the question of cost and reciprocity remains central, as discussed in our piece on the US-South Korea alliance.
In sum, South Korea’s emergence as a Quad alternative is not a replacement for India but a reflection of the region’s multipolar reality. As Yoon prepares to take office, his commitment to “freedom, peace, and prosperity through liberal democratic values” could make Seoul a linchpin of a more flexible, inclusive Indo-Pacific order.
