S Korea president apologises for martial law declaration

South Korea President Yoon Suk Yeol has apologised for declaring martial law earlier this week and has said there will not be another such order.

The embattled leader is facing potential impeachment following Tuesday night's declaration, which was quickly overturned in the National Assembly.

In response to the president's address, the leader of his ruling People Power Party (PPP) told reporters that it had become impossible for Yoon to continue his normal duty.

"His early resignation is inevitable," said Han Dong-hoon.

"I am very sorry and would like to sincerely apologise to the people who were shocked," Yoon said in his brief televised speech.

"Regarding the declaration of martial law, I will not avoid any legal or political responsibility."

It had been speculated that he would use the address to the nation - his first since declaring martial law - to resign but he did not do so, instead saying that he would delegate the work of stabilising the situation to his ruling party.

He also did not mention impeachment.

The opposition is pushing for a vote on the motion to impeach Yoon on Saturday. It needs at least eight members of Yoon's party to vote in favour for the motion to pass with a two-thirds majority in the 300-seat parliament.

Opposition leader Lee Jae-myung said he was disappointed with President Yoon's comments on Friday and that they would only increase the public's sense of anger and betrayal.

Lee added that he would do his best to remove the president from office.

"The greatest risk facing South Korea right now is the very existence of the president."