South Korea's president Yoon Suk Yeol shocked the country on Tuesday night when, out of the blue, he declared martial law in the country. It’s the first time such an order has been passed there in nearly 50 years. Yoon cited "anti-state forces" and the threat from North Korea. But it soon became clear that the move may have been politically motivated.

Within hours thousands of people gathered in protest, and opposition lawmakers rushed to remove the measure. Julie Yoonnyung Lee, a BBC World Service reporter, talks us why the announcement was so shocking - and how it could impact South Korea’s democracy.

Plus, Emilia Jansson from the What in the World team shares which other countries have used martial law, and why.

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