What has happened in South Korea and what does martial law have to do with it?

By Jessie Yeung, CNN

Seoul, South Korea (CNN) — South Korea is reeling after a whiplash six hours during which the country’s embattled president declared martial law but was forced to lift it amid widespread condemnation, throwing the country’s political landscape into chaos and uncertainty.

The saga began unfolding Tuesday night as most South Koreans prepared to go to sleep – prompting furious lawmakers to force their way past soldiers into parliament to strike down the decree, as protesters demanded President Yoon Suk Yeol’s removal and no return to the country’s painful authoritarian past.

By dawn, the president had caved – agreeing to lift martial law. But experts say he’s dug a political grave; opposition parties are trying to impeach him, police are investigating him for treason, and his own party is trying to oust him.

Questions are still swirling around the future of Yoon’s presidency, his party’s rule, and what happens next in one of the world’s most important economies and a major United States ally.

Here’s what we know.

What happened? What is martial law?

Yoon declared martial law around 10:30 p.m. local time Tuesday in an unannounced late-night TV address, accusing the country’s main opposition party of sympathizing with North Korea and of “anti-state” activities.

He also cited a motion by the opposition Democratic Party, which has a majority in parliament, to impeach top prosecutors and reject a government budget proposal.

Martial law refers to granting the military temporary rule during an emergency, which the president has the constitutional ability to declare. But the announcement hit like a bombshell, sending shock waves through a democratic nation and sparking an astonishing late-night political showdown.

In a nation with a strong contemporary tradition of free speech, Yoon’s military decree banned all political activities, including protests, rallies, and actions by political parties, according to Yonhap news agency. It also prohibited “denying free democracy or attempting a subversion,” and “manipulating public opinion.”

In the end, the decree only lasted a few hours.

Lawmakers flocked to the parliament, pushing their way past soldiers who had been deployed to keep the building blocked off.

In an extraordinary emergency late-night meeting, those present voted unanimously to block the decree, a vote the president is legally bound to obey.

The country’s political blocs came together to oppose Yoon’s decree – including members of his own party, with the party chief apologizing to the public and demanding an explanation from the president.

By 4:30 a.m., Yoon announced he would comply and lift the martial law order, saying he had withdrawn the troops deployed earlier in the night. But he doubled down on accusations that the opposition party was frustrating the moves of his government, urging lawmakers to stop their “legislative manipulation.”

Yoon’s cabinet voted to lift the decree soon after. The president has not made any public statements since.

Political paralysis

South Korea has been in a bitter political stalemate for months, with the country’s liberal opposition parties winning a parliamentary majority in April. The election was widely seen as a referendum on Yoon, whose popularity has plummeted due to a number of scandals and controversies since he took office in 2022.

Yoon, a conservative, has clashed with the opposition on many of his policies that require legislation, preventing him from moving forward on campaign promises to cut taxes and ease business regulations.

He has also grown increasingly frustrated with the opposition’s efforts to impeach government figures, some of whom he’d appointed – including the chair of the broadcasting watchdog, the chair of the state auditor, and several top prosecutors, according to Yonhap.

The prosecutors in particular are a sore point for Yoon. Opposition lawmakers argue they failed to indict Yoon’s wife, the first lady – who has been embroiled in scandal and accusations of stock manipulation, which the presidential office has repeatedly denied.

What was the response?

Outrage, shock and confusion ran through the country – and the world – in the immediate aftermath of the decree.

Protesters gathered outside the parliament building, calling for Yoon’s impeachment and the end of martial law, while lawmakers forced their way inside past nearly 300 troops that had been deployed to the grounds.

Even after Yoon lifted martial law, protests have continued – and are expected to swell in size over the weekend, with all eyes now on the impending impeachment proceedings.

What does it mean for the US?

The US voiced “grave concern” after Yoon declared martial law, and expressed relief after he lifted the decree – saying democracy was at the core of the US-South Korea alliance.

The two countries have a decades-old mutual defense treaty, which means both must come to the aid of the other if they are ever attacked.

There are nearly 30,000 American troops stationed in South Korea, across key US military installations – including Camp Humphreys, the largest US military base overseas.

Alongside Japan and the Philippines, which also have mutual defense treaties with the US, South Korea is part of a trio of regional partners that have helped to bolster American power in both Asia and the Pacific for decades.

Advocates argue that a significant US troop presence in the Korean Peninsula is crucial to deterring any potential attack from North Korea as Kim Jong Un’s regime continues to build its nuclear arsenal, and as a way of bolstering the US presence in the region to counter China’s aggression.

North Korea has also become a key player in Russia’s invasion of Ukraine by sending troops to help fight for Moscow’s forces, bringing an isolated Asian power into Europe’s largest conflict since the Second World War.

What happens now?

Yoon’s future remains uncertain as protesters and opposition figures demand his removal, with few allies left even within his own party.

South Korea’s national police are investigating Yoon and other top officials for alleged treason. Meanwhile, Lee’s Democratic Party said it had filed charges against Yoon and other officials for insurrection.

Opposition parties have introduced impeachment measures in Parliament, which could vote on the issue as early as Saturday. If it reaches the two-thirds majority to pass, it will then go to one of the country’s highest courts for further approval.

However, Yoon’s ruling People Power Party is working to block the move – with party leader Han Dong-hoon saying an impeachment would cause chaos among the public, though he criticized the president’s “unconstitutional martial law.” Instead, he is demanding Yoon leave the party entirely.

A number of government figures have resigned, including the former defense minister and Yoon’s chief of staff, while senior figures within the military have either distanced themselves from the martial law decree or indicated they were themselves caught unaware.

South Korea’s largest umbrella union also said on Wednesday its members would go on an indefinite general strike until Yoon resigns.

Is this unusual for South Korea?

Yes – especially given the country’s long, painful crawl toward democracy after decades of authoritarian rule.

South Korea has been a vibrant democracy since the 1980s, with regular protests, free speech, fair elections and peaceful transfers of power. The domestic political scene has long been fractious, with presidents on both sides of the political divide often facing prosecutions while in and out of office.

Martial law is unheard of in the modern democratic era, which has seen South Korea become a major exporter and a cultural powerhouse, thanks in part to the huge global popularity of K-pop and K-drama.

But South Korea has a dark political past. Throughout much of the Cold War, the country went through a series of strongman leaders and military rulers, who declared martial law multiple times – sometimes in a bid to hold onto power amid growing public dissatisfaction.

At the time, protests could easily turn deadly, with the military deployed to crack down on those pushing back.

The last time a South Korean president declared martial law was in 1980, during a nationwide uprising led by students and labor unions. It wasn’t until 1988 that South Korea elected a president through free and direct elections.

That’s why protesters Tuesday and Wednesday held signs and chanted slogans vowing to never go back to dictatorial rule, the memory of which remains fresh in many people’s minds.

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