President Yoon Suk Yeol announced the extraordinary move amid a bitter fight with the political opposition, and protesters clashed with police outside the assembly.

South Korean President Yoon Suk Yeol on Tuesday declared martial law in an unannounced late night address broadcast live on YTN television.

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Some 28,500 U.S. troops are stationed in South Korea to guard against the North. A spokesman for the U.S. military command did not answer repeated phone calls. There have been more than a dozen instances of martial law declaration since the foundation of the republic in 1948,

South Korean President Yoon Suk Yeol declared martial law, accusing opposition parties of sympathizing with North Korea and controlling parliament. NBC News' Janis Mackey Frayer reports on the situation in South Korea as protests continue late into the night and head to parliament.

South Korean President Yoon Suk Yeol dropped a bombshell late Tuesday evening local time by declaring 'emergency martial law.'

South Korean President Yoon Suk Yeol walked back his Tuesday declaration of martial law hours after the country's National Assembly voted to strike down his stunning decree that sparked a constitutional crisis for one of the closest U.