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.

The vote was the second major impeachment in two weeks after President Yoon’s ill-fated martial law bid set off turmoil. The country’s currency has plunged.

South Korea’s parliament impeached Acting President Han Duck-soo, dealing another blow to a government already reeling after President Yoon Suk Yeol’s suspension less than two weeks ago for his brief martial law decree.