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Seong Hyeon Choi

HomeSeong Hyeon Choi
Seong Hyeon Choi
Seong Hyeon Choi
Seong Hyeon Choi is a research fellow at the Central European Institute of Asian Studies (CEIAS) and a specialist in Chinese military affairs, North Korea’s foreign and nuclear policy, and South Korea’s defense ties with Europe.
Seong-Hyeon-Choi
Seong Hyeon Choi

Seong Hyeon Choi is a research fellow at the Central European Institute of Asian Studies (CEIAS) and a specialist in Chinese military affairs, North Korea’s foreign and nuclear policy, and South Korea’s defense ties with Europe.

Tumen River: North Korea's Strategic Veto

Tumen River: North Korea’s Strategic Veto

China and Russia have spent decades trying to open the Tumen River. North Korea continues to stand in their way. In May, Xi and Putin pledged to advance Chinese navigation through the border river, giving Beijing its strongest backing yet. The declaration reflects China’s ambition to secure direct access to the Sea of Japan.

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Reclaiming Command, Preserving the Alliance

Reclaiming Command, Preserving the Alliance

If war broke out tomorrow on the peninsula, South Korean forces would fight under an American general’s command. For 75 years, wartime operational control has rested with Washington, and Seoul has never taken it back. President Lee Jae-myung means to change that.

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Pyongyang Rewrites the Logic of Dialogue

Pyongyang Rewrites the Logic of Dialogue

For more than half a century, North Korea insisted that the South was not a foreign country. It was the other half of one nation, split by war and awaiting reunification. Its constitution now says otherwise. References to national reunification, peaceful reunification, and great national unity have vanished.

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Japan's Narrow Defense Export Path

Japan’s Narrow Defense Export Path

Japan is entering the arms market through a narrow door. After decades of restraint, Tokyo is loosening its defense export rules—but not to become the next South Korea, China, or United States. The shift is less a bid for market share than a strategic adjustment shaped by Japan’s industrial history and built-in structural constraints.

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Hormuz and the New Logic of Coercion

Hormuz and the New Logic of Coercion

The dual blockade in the Strait of Hormuz signals a shift in how power is exercised at sea. Geography is reasserting itself as a decisive variable in global affairs. The recent maritime coercion fits within a structural transformation in which control of strategic chokepoints has become an operational lever of coercion.

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Iran Operation Raises Stakes For North Korea

Iran Operation Raises Stakes For North Korea

The recent joint U.S.–Israeli operation against Iran has sent shockwaves far beyond the Middle East. While the primary theater is the Arabian Gulf, the conflict’s strategic reverberations have found immediate resonance on the Korean Peninsula.

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Europe's Security, Korea's Arsenal

Europe’s Security, Korea’s Arsenal

For decades, NATO operated under a predictable security architecture, with the United States providing a high-tech arsenal for European allies. However, the war in Ukraine has exposed the brittle nature of Western industrial production capacity and the costs of US hardware. Amid this, a new “K-Defense” wave is reshaping the alliance’s procurement strategy.

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NATO's Arctic Readiness Gap

NATO’s Arctic Readiness Gap

NATO’s role in the Arctic has undergone a dramatic transformation, shifting from a Norwegian policy of “High North, Low Tension”—designed to promote regional stability and cooperation with Russia after the Cold War—to one of strategic necessity. Yet NATO’s expanding political commitments have outpaced its actual capacity to sustain forces in extreme latitudes.

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The Pyongyang Factor in Ukraine Peace Talks The Pyongyang Factor in Ukraine Peace Talks

The Pyongyang Factor in Ukraine Peace Talks

Since assuming office in January 2025, President Donald Trump has attempted to fulfill his campaign promise to end the Russia–Ukraine war. While the administration has made significant progress toward a settlement, negotiations remain stalled over the Donbas region and the Russian-occupied Zaporizhzhia nuclear power plant.

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Decapitation Fears Reshape North Korea's Strategic Posture

Decapitation Fears Reshape North Korea’s Strategic Posture

The capture of Venezuelan leader Nicolás Maduro by U.S. special forces has altered Kim Jong Un’s strategic calculus by collapsing the distinction between wartime and peacetime threats to regime survival. For Pyongyang, the nuclear deterrent no longer functions as a bargaining chip, but rather as a core instrument of regime survival.

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