South Korean Defense Minister Kim Yong Hyun speaks during a news conference with Secretary of State Antony Blinken, and Defense Secretary Lloyd Austin at the State Department in Washington, D.C., on Oct. 31, 2024. Celal Gunes/Anadolu via Getty Images

South Korean prosecutors on Sunday detained a former defense minister who allegedly recommended last week's brief but stunning martial law imposition to President Yoon Suk Yeol, making him the first figure detained over the case, news reports said.

The reported development came a day after Yoon avoided an opposition-led bid to impeach him in parliament, with most ruling party lawmakers boycotting a floor vote to prevent the two-thirds majority needed to suspend his presidential powers. The main liberal opposition Democratic Party said it will prepare a new impeachment motion against Yoon.

However, according to Agence France-Presse, Yoon's ruling People Power Party said in a statement Sunday that it had "effectively obtained (Yoon's) promise to step down."

"Until the president steps down, the president will be effectively excluded from his duties," it said in the statement, per AFP.

People Power Party leader Han Dong-hoon and South Korean Prime Minister Han Duck-soo were set to meet later Sunday to discuss plans for Yoon's "orderly retreat", the party said.

On Sunday, ex-Defense Minister Kim Yong Hyun voluntarily appeared at a Seoul prosecutors' office, where he had his mobile phone confiscated and was detained, Yonhap news agency reported.

Other South Korean media carried similar reports, saying Kim was moved to a Seoul detention center. The reports said police were searching Kim's former office and residence on Sunday.

Repeated calls to the Seoul Central District Prosecutors' Office and the Supreme Prosecutors' Office were unanswered. An official at the detention facility in eastern Seoul hung up the phone when The Associated Press called.

Yoon accepted Kim's resignation offer on Thursday after opposition parties submitted a separate impeachment motion against him.

Kim is a central figure in Yoon's martial law enforcement, which led to special forces troops encircling the National Assembly building and army helicopters hovering over it. The military withdrew after the parliament unanimously voted to overturn Yoon's decree, forcing his Cabinet to lift it before daybreak Wednesday.

In Kim's impeachment motion document, the Democratic Party and other opposition parties accused him of proposing martial law to Yoon. Ruling party leader Han Dong-hun made a similar comment on Kim's role. Vice Defense Minister Kim Seon Ho told parliament that Kim Yong Hyun ordered the deployment of troops to the National Assembly.

The Democratic Party called Yoon's martial law imposition "unconstitutional, illegal rebellion or a coup." It has filed complaints with police against at least nine people, including Yoon and Kim, over the alleged rebellion.

In a statement distributed by the Defense Ministry on Wednesday, Kim said that "all troops who performed duties related to martial law were acting on my instructions, and all responsibility lies with me."

Prosecutor General Shim Woo Jung told reporters on Thursday the prosecution plans to investigate the rebellion charges against Yoon following complaints filed by the opposition.

While the president mostly has immunity from prosecution while in office, that does not extend to allegations of rebellion or treason. It wasn't immediately clear how the prosecution plans to proceed with an investigation into Yoon.

The Defense Ministry said it has suspended three top military commanders over their alleged involvement in the martial law imposition. They were among those facing the opposition-raised rebellion allegations.

On Saturday, Yoon issued an apology over the martial law decree, saying he won't shirk legal or political responsibility for the declaration and promising not to make another attempt to impose it. He said would leave it to his party to chart a course through the country's political turmoil, "including matters related to my term in office."

Since taking office in 2022, Yoon has struggled to push his agenda through an opposition-controlled parliament and grappled with low approval ratings amid scandals involving himself and his wife. In his martial law announcement on Tuesday night, Yoon called parliament a "den of criminals" bogging down state affairs and vowed to eliminate "shameless North Korea followers and anti-state forces."

The declaration of martial law was the first of its kind in more than 40 years in South Korea. The turmoil has paralyzed South Korean politics and sparked alarm among key diplomatic partners like the U.S. and Japan.

The scrapping of Yoon's impeachment motion is expected to intensify protests calling for his ouster and deepen political chaos in South Korea, with a survey suggesting a majority of South Koreans support the president's impeachment.

Yoon's martial law declaration drew criticism from his own ruling conservative People Power Party, but it is determined to oppose Yoon's impeachment apparently because it fears losing the presidency to liberals.

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