Police will be out in force, and subway stations and at least one school will be closed over safety concerns when South Korea's Constitutional Court rules whether to oust or reinstate impeached President Yoon Suk Yeol.

Police could also shut down gas stations near the court on the day of Yoon’s impeachment ruling, the official said. On Sunday, a day after Yoon returned home, thousands of his supporters gathered around his residence to protest the impeachment, surrounded by beefed-up police security.

South Korea's air traffic authorities will ban drones from flying around the Constitutional Court in Seoul from Thursday ahead of the ruling on the impeachment of President Yoon Suk Yeol. The measure will take effect from Thursday to Wednesday next week,

Investigators have alleged that Yoon's martial-law decree amounted to rebellion. If is convicted of that offense, he would face the death penalty or life imprisonment.

If South Korea formally impeaches its suspended president over his martial law debacle, one firebrand pastor says he is ready for "revolution".