South Korea is reeling after a whiplash eight hours during which the country’s embattled president declared martial law but was forced to lift it amid widespread condemnation, throwing the country’s political landscape into chaos and uncertainty.

Officials pledged “unlimited” support to markets as traders digested the implications of South Korea’s brief declaration of martial law.

The political roller-coaster of President Yoon Suk Yeol’s declaration then suspension of martial law was extreme even by the standards of South Korea.

SEOUL, South Korea -- South Korea's opposition party urges President Yoon to resign or face impeachment over martial law decree.

Yoon Suk Yeol’s decree, and his reversal under pressure from lawmakers, were the culmination of years of feuding between the country’s two main political camps.

Though martial law isn't well defined in U.S. law, it has been imposed at the state and federal level to respond to emergencies.

South Korean President Yoon Suk Yeol's shocking late-night declaration of martial law brought years of clashes with domestic opponents, the media and even his own conservative party to a head and threw his political future into doubt.

South Korean President Yoon Suk Yeol declared martial law in an unannounced late-night TV address Tuesday, accusing the country’s main opposition party of sympathizing with North Korea and of anti-state activities.

Parliamentary aides in South Korea emptied fire extinguishers on armed troops entering the national assembly as protesters took to the streets.

South Korea’s opposition party members gather at the country's parliament building on Dec. 4 after the president declared martial law.