South Korean investigators entered the residence of impeached President Yoon Suk Yeol and began executing a warrant for his arrest Friday over his failed martial law bid, the first time the country has ever sought to arrest a sitting leader. “The execution of the arrest warrant for President Yoon Suk Yeol has begun,” said the Corruption Investigation Office (CIO), which is probing Yoon’s short-lived declaration of martial law, with its officials…