A deepening political crisis in South Korea has not diminished the military readiness of 28,500 troops stationed in the Asian state, a U.S. official said on Friday, but Washington is closely monitoring the situation.

South Korea's acting President Han Duck-soo has been impeached by the opposition party controlling the National Assembly. This comes weeks after President Yoon Suk Yeol's imposed martial law, leading to his own impeachment.

The impeachment of Han Duck-soo, acting president since Yoon was impeached on Dec. 14 for declaring martial law, has thrown South Korea's once-vibrant democratic success story into uncharted territory.

The South Korean parliament voted Friday to impeach Acting President Han Duck-soo, just days after his predecessor Yoon Suk Yeol was impeached over declaring a short-lived martial law.The liberal opposition bloc led by the Democratic Party,

America must assess whether the next South Korean president would continue the policies of Yoon Suk Yeol, a supporter of U.S. foreign initiatives.