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 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,

SEOUL — South Korea's opposition said on Thursday it filed an impeachment motion against acting President Han Duck-soo, in an escalating row over the composition of the Constitutional Court which would decide whether to remove his predecessor from office.