January 15, 2025
The global ripple effects of South Korea’s political turmoil
The global ripple effects of South Korea’s political turmoil

What happens in Seoul doesn’t stay in Seoul. South Korea’s Constitutional Court this week is beginning impeachment trial proceedings in the case of President Yoon Suk Yeol. The parliament voted to impeach Yoon on December 14, in response to his aborted attempt to declare martial law, leading to his suspension from office and the installation of President Han Duck-soo as the country’s temporary leader. The impact of this high political drama will be felt far beyond South Korea’s shores. So we turned to our experts to explore the burning questions about what’s going on and what it all means for the region and the United States.


1. Why was Yoon impeached?

Yoon was impeached by the National Assembly on December 14 for his unconstitutional attempt to impose martial law. Yoon had declared martial law on December 3, citing the need to protect South Korea from “North Korean communist forces” and “anti-state forces,” as well as to “rebuild and protect” the nation from “falling into ruin.” He accused the opposition party of attempting to undermine democracy by impeaching his cabinet members and blocking budget plans. His decision appears to have been influenced by right-wing YouTube channels that propagated conspiracy theories, exaggerating perceived threats to his administration. The impeachment underscores the effectiveness of democratic checks and balances, as Yoon’s misguided and authoritarian decision was ultimately overturned through parliamentary action.

Sungmin Cho is a nonresident senior fellow in the Indo-Pacific Security Initiative at the Atlantic Council’s Scowcroft Center for Strategy and Security.

Impeachment is a rare occurrence in the United States, with only three presidents having faced the process in nearly two-and-a-half centuries. Conversely, South Korea has seen three presidents face impeachment in just twenty years, with several others leaving office in less-than-ideal circumstances. 

Nor is martial law unknown in South Korea. The country experienced it under the control of Park Chung-hee in the 1970s. Then, the South Korean people fought with blood, sweat, and tears to institute a true democracy. It’s under this context, with martial law in the living memory of many in the country, that South Korea was galvanized to call for impeachment for an already massively unpopular Yoon. South Koreans are very protective of their democracy, and Yoon’s attempt at martial law drew comparisons to the authoritarian Park Chung-hee government, especially since Yoon’s first move after the martial law declaration was seemingly to block the National Assembly from voting to end it. This move was undoubtedly one step too far for the South Korean public and the calls for impeachment were a statement from the population that they will not take a threat to the democratic process lightly. 

Lauren D. Gilbert is a deputy director with the Atlantic Council’s Indo-Pacific Security Initiative.


2. What is the potential removal process?

After the National Assembly impeached Yoon, his powers were immediately suspended, and the prime minister assumed the role of acting president. The impeachment case will now be reviewed by the Constitutional Court, which has up to 180 days to decide if Yoon violated the Constitution or laws to a degree warranting removal. In former President Park Geun-hye’s impeachment case that began in late 2016, the Constitutional Court took ninety-two days to reach a decision. Both Yoon and the National Assembly will present arguments, evidence, and witnesses in a trial-like process before the judges of the Constitutional Court. If upheld, Yoon will be formally removed from office, triggering a presidential election within sixty days; if rejected, he will be reinstated. Throughout this period, public opinion and political debates will intensify as the nation awaits the court’s final decision.

—Sungmin Cho

Now that Yoon is facing impeachment, the Constitutional Court has 180 days to decide, and the vote requires at least six of the full court’s nine judges to vote yes for impeachment. However, at present, the court only has six judges, with three seats on the court left vacant. This is leading to a debate over how and when the court should proceed. Some say that the vote should go through with the six current judges, while others say the vacant seats must be filled first. 

There is also debate over whether the judges should be appointed by the National Assembly or whether Prime Minister Han Duck-soo, who has taken over the presidency during the impeachment process, has the right to appoint the three judges. Further complicating matters, the court has several other impeachment cases still awaiting its decision, adding to the oversaturation of the Constitutional Court. While we await the decision on how they will proceed with the appointment (or not) of the three vacant seats, there is still the possibility that Yoon’s impeachment will be overturned. There is a precedent for this. Former president Roh Moo-hyun’s impeachment was overturned in 2004, although unlike Yoon, Roh had the public’s support.

—Lauren D. Gilbert


3. What does this mean for South Korea’s relations with Japan?

In the immediate term, Japan and South Korea will broadly continue to communicate and coordinate along the lines forged over the past two-and-a-half years. However, South Korea and also to some extent Japan will have limited political capital to undertake any new measures to strengthen the relationship. Instead, Tokyo and Seoul are focusing on making both their bilateral relations and the trilateral security framework with Washington resilient and long-lasting to minimize the effects of political revisions in the future.

Japan is concerned about who will take the presidency in South Korea if the impeachment is upheld. The political momentum gained by progressives in Seoul is raising concerns about a reversal of the progress made in Japan-South Korea relations in recent years. On the plus side, however, Japan and South Korea have rebuilt ties and worked on the strategic and operational mechanisms and procedures of close coordination, setting a strong precedent for the future.  

Ryo Hinata-Yamaguchi is a nonresident senior fellow with the Indo-Pacific Security Initiative.


4. What does this mean for relations with Washington and trilateral security cooperation with the US and Japan?

In the near term, the acting president, Han, is already moving to ensure continued alliance coordination between Seoul and Washington. Key meetings and working-level coordination are likely to return to some semblance of normalcy, as the institutional memory and mechanisms of the alliance are strong. However, in practical terms, the timing of this political crisis will make it challenging to have high-level strategic coordination or make progress on key alliance issues in 2025. South Korea will have only an acting president when US President-elect Donald Trump takes office in January. And depending on how long the Constitutional Court takes to decide the impeachment case, it could be as long as eight months from now before a new president is elected. We also cannot rule out a prolonged period of uncertainty followed by Yoon’s return to office, in a much-weakened and tenuous position, in the event the court does not uphold the impeachment.

Markus Garlauskas is the director of the Indo-Pacific Security Initiative and a former national intelligence officer for North Korea.


5. What can we expect from North Korea right now?

North Korea appears to have been laying the groundwork for a renewed military confrontation with South Korea for some time now, and it could initiate that confrontation at a particularly inopportune moment for the alliance. Pyongyang’s silence so far suggests that North Korea will wait for the outcome of the Constitutional Court’s decision and the election of a new president in South Korea before moving to take advantage of the situation, however. North Korea likely recognizes that pursuing a confrontation with Han, the interim president, could simply strengthen the position of South Korean conservatives inclined to take a harder line against North Korea. Meanwhile, before pushing too far, North Korean leader Kim Jong Un is likely to want some time to probe Trump’s new position. 

A major thaw in relations is unlikely, even if South Koreans elect a progressive president inclined to engage Pyongyang, given Kim’s moves this year to reinforce the permanence of the division between North and South. Despite optimism in some quarters about the possibility of renewed Trump-Kim summitry in 2025, not much is likely to result. A lot has changed in the four years since Trump left office, and Kim’s position has solidified in ways that make it much less likely that he would be willing to offer major, meaningful concessions to Washington or Seoul.

—Markus Garlauskas

On the surface, North Korea’s response to the political crisis has been limited to domestic media commentary and has refrained from openly confronting South Korea so, perhaps to prove wrong Yoon’s claims about North Korean infiltration. At the same time, the political turmoil in South Korea is a prime situation for North Korea to carry out covert cognitive warfare—particularly through social media and other communication methods. In particular, Pyongyang would be piggybacking and boosting the criticisms in South Korea toward Yoon and the conservatives. 

For North Korea, such measures are essentially about investing in the return of the progressives to power, which North Korea could exploit to make South-North relations and circumstances on the peninsula more advantageous for Pyongyang. North Korea’s new official policy of recognizing South Korea as an “adversary” rather than a “partner for unification” was not only to bolster its militarily confrontational stance, but a means of hybrid warfare to apply further pressure on Seoul—particularly vis-à-vis the progressives. Hence for now, North Korea will likely see how the situation in South Korea plays out while also ensuring that it has the upper hand in dictating the direction of inter-Korean relations.

—Ryo Hinata-Yamaguchi

Further reading

Related Experts:
Ryo Hinata-Yamaguchi,
Markus Garlauskas, and
Lauren D. Gilbert

Image: Protesters wave K-pop light sticks with placards reading “immediate arrest” during a rally demanding the arrest, of impeached South Korean President Yoon Suk Yeol in downtown Seoul. Kim Jae-Hwan / SOPA Images via Reuters Connect.

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