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 impeachment of South Korea’s acting President Han Duck-soo has plunged the country into further political turmoil, coming less than two weeks after lawmakers impeached President Yoon Suk Yeol.

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.