SEOUL, Dec 4 (Reuters) - Hyundai Motor's ( HYMTF )

labour union plans to stage strikes for four hours each on

Thursday and Friday, a union spokesperson said on Wednesday.

South Korea's Metal Workers' Union, of which the Hyundai

Motor ( HYMTF ) union is part, plans to launch a full strike from Dec. 11

unless South Korean President Yoon Suk Yeol steps down, Yonhap

news agency reported on Wednesday.

Yoon is under fire to resign or face impeachment after he

declared martial law only to reverse the move hours later,

drawing criticism from various unions and groups.

Hyundai Motor ( HYMTF ) was not immediately available for comment.