N. Korea's heir apparent son on standby during Kim's trip to Russia, China
SEOUL, Aug.
(ATTN: ADDS more details in para 10)
By Yoo Jee-ho
(ATTN: ADDS bond yields at bottom)
By Yoo Jee-ho
(ATTN: ADDS relaxed entry ban for South Korean firms in last three paras)
By Chang Jae-soon
(ATTN: UPDATES with quotes by Kwak and a prosecutor, possible punishment, more details in paras 8-13)
SEOUL, Aug. 29 (Yonhap) -- Dongkuk Steel Mill Co., South Korea's No.