Huge crowds gather for impeachment vote on South Korean president Yoon Suk Yeol

Opposition needs ruling party support to suspend president over insurrectionary' martial law bid, while removal would need court approval

Thousands have taken to the streets of South Korea's capital, Seoul, in rival rallies as President Yoon Suk Yeol faces an impeachment vote over his failed martial law bid.

Protests demanding Yoon step down kicked off around midday outside the National Assembly. Seoul police said they expected at least 200,000 people to demonstrate in support of removing him.