(2nd LD) U.S. House approves legislation significantly tightening sanctions on N. Korea
(ATTN: REWRITES dateline, para 2; ADDS reaction from S. Korea's foreign ministry in last 3 paras)
By Chang Jae-soon
WASHINGTON/SEOUL, May 5 (Yonhap) -- The U.S. House of Representatives voted overwhelmingly to pass legislation significantly tightenin