North Korea says leader Kim Jong Un has observed test-flights of hypersonic missiles and underscored the need to bolster the country’s nuclear war deterrent.

Lee’s visit is positive sign for China-South Korea relations. But both sides must heed the lessons from the THAAD dispute.

South Korea's President Lee Jae Myung left for China on Sunday, eager to boost economic ties with Seoul's largest trading partner while keeping a lid on potentially explosive issues such as Taiwan.The South Korean president plans to pitch a potential role for China in his efforts to rekindle frayed ties with the North,