When South Korea's Constitutional Court rules on President Yoon Suk Yeol's impeachment, expected in coming days, few will be watching more closely - or be watched more closely for possible rabble-rousing - than the country's activist pro-Yoon churches.

South Korean President Yoon Suk Yeol, who lawmakers voted to impeach and was indicted on criminal charges for declaring martial law last December, was cleared to be released from detention on Friday.

Thousands of South Koreans have filled the streets of downtown Seoul in massive rival rallies for and against impeached President Yoon Suk Yeol.